Add AsEntityListener attribute

[nicolas-grekas]

Fix #1343

[nicolas-grekas]

PR ready, please advise what do to with psalm errors as they are false positives.

[ostrolucky]

Use this

if (! method_exists(ContainerBuilder::class, 'getAutoconfiguredAttributes')) {
    $this->markTestSkipped('symfony/dependency-injection 5.3.0 needed');
}

Regarding cs issue, I've pushed coding-standard update which should fix it, you just need to rebase