In this change, Doctrine and validation annotations have been replaced with PHP8 Attributes. The Rector tool has been configured with a list of annotations to convert to attributes. As a consequence, the PHPStan's rules have been updated to reflect these changes. The PHP8's nullable operator (?) has been added where required, and comments in field declaration have been replaced with #[Attribute] syntax.
The `chill.role` tag has been renamed to `chill_main.provide_role` to prevent any confusion and make the namespaces more consistent. During this process, the class RoleProvidersCompilerPass was deleted, simplifying the role provision process by injecting tagged services directly into the RoleProvider. The change is also reflected in multiple YAML service configurations and explained in the MIGRATION.md file.
