Fix drupal-check errors

Problem/Motivation

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  Line   src/CitationFieldFormatterBase.php                                   
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  :134   Caught class Drupal\citation_select\Exception not found.             
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols   
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  Line   src/CitationProcessorService.php                                                 
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  :17    Property                                                                         
         Drupal\citation_select\CitationProcessorService::$citationFieldFormatterManager  
         has unknown class                                                                
         Drupal\citation_select\Drupal\citation_select\CitationFieldFormatterInterface    
         as its type.                                                                     
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :24    Property                                                                         
         Drupal\citation_select\CitationProcessorService::$configFactory has              
         unknown class                                                                    
         Drupal\citation_select\Drupal\Core\Config\ConfigFactoryInterface as              
         its type.                                                                        
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :31    Property                                                                         
         Drupal\citation_select\CitationProcessorService::$dateFormatter has              
         unknown class                                                                    
         Drupal\citation_select\Drupal\Core\Datetime\DateFormatterInterface as            
         its type.                                                                        
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :38    Property                                                                         
         Drupal\citation_select\CitationProcessorService::$entityTypeManager              
         has unknown class                                                                
         Drupal\citation_select\Drupal\Core\Entity\EntityTypeManagerInterface             
         as its type.                                                                     
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :57    Call to method get() on an unknown class                                         
         Drupal\citation_select\Drupal\Core\Config\ConfigFactoryInterface.                
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :67    Call to method getStorage() on an unknown class                                  
         Drupal\citation_select\Drupal\Core\Entity\EntityTypeManagerInterface.            
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :76    Call to method getDefinitions() on an unknown class                              
         Drupal\citation_select\Drupal\citation_select\CitationFieldFormatterInterface.   
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :91    Call to method createInstance() on an unknown class                              
         Drupal\citation_select\Drupal\citation_select\CitationFieldFormatterInterface.   
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :94    Call to method createInstance() on an unknown class                              
         Drupal\citation_select\Drupal\citation_select\CitationFieldFormatterInterface.   
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :235   Call to method get() on an unknown class                                         
         Drupal\citation_select\Drupal\Core\Config\ConfigFactoryInterface.                
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
  :259   Call to method format() on an unknown class                                      
         Drupal\citation_select\Drupal\Core\Datetime\DateFormatterInterface.              
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols               
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  Line   src/Form/CslMapForm.php                                               
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  :22    Property Drupal\citation_select\Form\CslMapForm::$entityFieldManager  
         has unknown class                                                     
         Drupal\citation_select\Form\Drupal\Core\Entity\EntityFieldManager as  
         its type.                                                             
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols    
  :273   Call to method getFieldStorageDefinitions() on an unknown class       
         Drupal\citation_select\Form\Drupal\Core\Entity\EntityFieldManager.    
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols    
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  Line   src/Form/SelectCitationForm.php                                               
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  :37    Property                                                                      
         Drupal\citation_select\Form\SelectCitationForm::$citationProcessor            
         has unknown class                                                             
         Drupal\citation_select\Form\Drupal\citation_select\CitationProcessorService   
         as its type.                                                                  
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols            
  :71    Variable $styler in PHPDoc tag @var does not match assigned variable          
         $citation_styler.                                                             
  :160   Call to method getCitationArray() on an unknown class                         
         Drupal\citation_select\Form\Drupal\citation_select\CitationProcessorService.  
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols            
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  Line   src/Plugin/CitationFieldFormatter/EdtfDateFormatter.php  
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  :25    Call to an undefined method EDTF\EdtfValue::getYear().   
  :26    Call to an undefined method EDTF\EdtfValue::getMonth().  
  :27    Call to an undefined method EDTF\EdtfValue::getDay().    
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  Line   src/Plugin/CitationFieldFormatter/TypedRelationFormatter.php                                     
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  :25    Property                                                                                         
         Drupal\citation_select\Plugin\CitationFieldFormatter\TypedRelationFormatter::$configFactory      
         has unknown class                                                                                
         Drupal\citation_select\Plugin\CitationFieldFormatter\Drupal\Core\Config\ConfigFactoryInterface   
         as its type.                                                                                     
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols                               
  :33    PHPDoc tag @param references unknown parameter: $account                                         
  :59    Call to an undefined method                                                                      
         Drupal\Core\Field\FieldItemListInterface<Drupal\Core\Field\FieldItemInterface>::getIterator().   
  :104   Call to method get() on an unknown class                                                         
         Drupal\citation_select\Plugin\CitationFieldFormatter\Drupal\Core\Config\ConfigFactoryInterface.  
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols                               
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  Line   tests/src/Kernel/CitationPluginTests.php                                       
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  :106   Access to an undefined property                                                
         Drupal\Tests\citation_select\Kernel\CitationPluginTests::$citation_processor.  
  :124   Access to an undefined property                                                
         Drupal\Tests\citation_select\Kernel\CitationPluginTests::$entity_formatter.    
  :142   Access to an undefined property                                                
         Drupal\Tests\citation_select\Kernel\CitationPluginTests::$entity_formatter.    
  :157   Access to an undefined property                                                
         Drupal\Tests\citation_select\Kernel\CitationPluginTests::$entity_formatter.    
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 [ERROR] Found 28 errors