[TASK] Replace inject methods with @inject; allow @Flow\Inject

Currently we are using inject methods like:

/*
 * @param $foo Foo
 */
public function injectFoo(Foo $foo) {
	$this->foo = $foo;
}

This patch removes these methods and introduces
property annotations:

/**
 * @var Foo
 * @inject
 */
protected $foo;

Besides that, it allows the use of @Flow\Inject
as well for compatibility to Flow.

Releases: 6.2
Resolves: #46598
Change-Id: Ied219d465dfa8fce24a819a7fc58a2ff8cb5401c