[DoctrineBridge] Allow EntityValueResolver to return a list of entities

[HypeMC]

Q	A
Branch?	7.1
Bug fix?	no
New feature?	yes
Deprecations?	no
Issues	Fix #53236 (sort of)
License	MIT

Makes the following possible:

#[Route('/{author_id}', name: 'app_test')]
public function index(
    #[MapEntity(class: Post::class, expr: 'repository.findBy({"author": author_id}, {}, 10)')]
    iterable $posts
): Response {
// ...
}

This is actually something that used to be possible with the SensioFrameworkExtraBundle.

[nicolas-grekas]

Thank you @HypeMC.