[FEATURE] Implemented PHPStan level 8, introduced some DTO classes to prevent some multidimensional array shapes, introduced BackendUserTrait and LanguageServiceTrait

[RinyVT]

This PR is set to the feature/13-compatibility branch, but first the pipeline should succeed before merging.

Summary

This PR can be summarized in the following changelog entry:

• Bugfixes for the TYPO3 13.3 release
  • Added check for the autogenerated columns in the TCA of tx_yoastseo_related_focuskeyword to not get included in 13
  • Fixed the layout / templates for the backend modules
  • Fixed the styling for the dashboard widgets
• Implemented phpstan level 8
  • A lot of (return) types, especially array shapes, have been added
  • Some c
• Introduced new structure for the DataProviders for the Overview backend module
  • Instead of registering it through the EXTCONF they are configured within Services.yaml
  • New methods have been added to OverviewDataProviderInterface to return the values that were previously in the array
  • New DataProviderRequest added which is created in the OverviewController and then passed to the data provider through a new initialize method (replaces the previous callerParams functionality)
• LanguageMenuFactory has been added to move the code from the OverviewController
• Added a BackendUserTrait and LanguageServiceTrait to remove duplicate code

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended