[Core 11.3] Code update

Problem/Motivation

Reduce useless code now that new PHP and Drupal Core API's are available.

- convert hook into oop hook
- no procedural hook: https://www.drupal.org/node/3490771 and https://www.drupal.org/node/3498595
- Constructor promotion
- service autowire
- plugin autowire: https://www.drupal.org/node/3542837
- convert tests @group annotation into Attribute
- update phpstan config file
- add .gitattributes file to not export files
- minimum Core requirement 11.3, create a 1.x branch for a 1.2.0 release.
- config schema validation: https://www.drupal.org/node/3404425
- config form target: https://www.drupal.org/node/3373502