Facets Exposed Filters - DateItemProcessor not working

For now, "facets exposed filters" uses hardcoded query_type_text.
We need to add querytype plugins support.

Attached is a patch which adds support for different querytypes (e.g. date & range)

This patch breaks showing active facet items with 0 results, as the facet results now act similar to how facet block facet results act.
We probably want to ensure active facet items with 0 items are always visible, both for the old "facet blocks" way, as for "facets exposed filters". This is even more important for "facets exposed filters", as we do not control the url ourself, and views wont remember non-existing elements.

This patch seems to work great! Thanks.

This seems related, but I'm not entirely sure. Let me know if it would be better to open a new issue.

When I attempt to enable the Range Slider processor/widget on facets_exposed_filter, I encounter this error:

```
TypeError: Cannot access offset of type string on string in Drupal\facets\Entity\Facet->getWidgetInstance() (line 395 of modules/contrib/facets/src/Entity/Facet.php).
Drupal\facets_range_widget\Plugin\facets\processor\SliderProcessor->postQuery(Object) (Line: 144)
Drupal\facets_exposed_filters\Plugin\views\filter\FacetsFilter->valueForm(Array, Object) (Line: 969)
Drupal\views\Plugin\views\filter\FilterPluginBase->buildExposedForm(Array, Object) (Line: 103)
Drupal\views\Form\ViewsExposedForm->buildForm(Array, Object)
call_user_func_array(Array, Array) (Line: 536)
Drupal\Core\Form\FormBuilder->retrieveForm('views_exposed_form', Object) (Line: 283)
Drupal\Core\Form\FormBuilder->buildForm('\Drupal\views\Form\ViewsExposedForm', Object) (Line: 134)
Drupal\views\Plugin\views\exposed_form\ExposedFormPluginBase->renderExposedForm() (Line: 115)
facets_exposed_filters_views_post_execute(Object)
call_user_func_array(Object, Array) (Line: 409)
Drupal\Core\Extension\ModuleHandler->Drupal\Core\Extension\{closure}(Object, 'facets_exposed_filters') (Line: 388)
Drupal\Core\Extension\ModuleHandler->invokeAllWith('views_post_execute', Object) (Line: 416)
Drupal\Core\Extension\ModuleHandler->invokeAll('views_post_execute', Array) (Line: 1450)
Drupal\views\ViewExecutable->execute(NULL) (Line: 1469)
Drupal\views\ViewExecutable->render() (Line: 131)
Drupal\views\Plugin\views\display\Block->execute() (Line: 1645)
Drupal\views\ViewExecutable->executeDisplay('block_2', Array) (Line: 81)
Drupal\views\Element\View::preRenderViewElement(Array) (Line: 61)
Drupal\views\Plugin\Block\ViewsBlock->build() (Line: 240)
Drupal\block_field\Plugin\Field\FieldFormatter\BlockFieldFormatter->preRender(Array)
...
```

Please open a new issue for this :)

Automatically closed - issue fixed for 2 weeks with no activity.