Add CI tasks

I fixed some obvious and easy phpstan and cspell errors.

I did not manage to understand why cspell is throwing this error:
src/Form/BundleSettingsForm.php:51:48 - Unknown word (Inferface) -- Entity\ContentEntityTypeInferface
Suggestions: [interface, Interface, Inference, Interlace, Interrace]

There are some phpstan errors in CopyLayout.php which did not seem so trivial, so i left them out. They can be fixed in a separate issue
166 Parameter $original of method
Drupal\content_entity_clone\Plugin\content_entity_clone\FieldProcessor\CopyLayout::cloneBlockContentEntity()
has invalid type
Drupal\content_entity_clone\Plugin\content_entity_clone\FieldProcessor\BlockContentInterface.
174 Access to an undefined property
Drupal\content_entity_clone\Plugin\content_entity_clone\FieldProcessor\CopyLayout::$blockContentStorage.
💡 Learn more:
https://phpstan.org/blog/solving-phpstan-access-to-undefined-property