Feature: #94345 - Auto-detect event types

See Issue #94345

Description

If no “event” tag is specified on an event listener in Services.yaml, the event is automatically derived from the event method itself using reflection.

Impact

In the vast majority of cases, the “event” tag on an event listener in Services.yaml is no longer necessary.

Given this example event listener implementation:

final class CategoryPermissionsAspect
{
    public function addUserPermissionsToCategoryTreeData(ModifyTreeDataEvent $event): void
    {
       // ...
    }
}

With this registration:

TYPO3\CMS\Backend\Security\CategoryPermissionsAspect:
    tags:
      - name: event.listener
        identifier: 'backend-user-permissions'
        method: 'addUserPermissionsToCategoryTreeData'
        event: TYPO3\CMS\Core\Tree\Event\ModifyTreeDataEvent

The event: tag can be omitted, since it’s automatically read from the method signature addUserPermissionsToCategoryTreeData(ModifyTreeDataEvent $event) of the listener implementation:

TYPO3\CMS\Backend\Security\CategoryPermissionsAspect:
    tags:
      - name: event.listener
        identifier: 'backend-user-permissions'
        method: 'addUserPermissionsToCategoryTreeData'