Drupal 11 compatibility and gitlab

I know it is failing, but that is next major since paragraphs is not yet compatible with d11. Declaring compatibility is fine since we this modules is not holding back d11.

Added gitlab yaml with phpstan which will help with developement, did do a few fixes for codestle :)

Fixed in 📌 Automated Drupal 11 compatibility fixes for paragraphs_edit Needs review