feat: Add symfony serializer

[CarlSchwan]

nextcloud/server#63545

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[come-nc]

What for?
And why does this also add 4 other dependencies? (if they are indirect deps composer will pull them without needing to explicitely list them right?)

[CarlSchwan]

What for? And why does this also add 4 other dependencies? (if they are indirect deps composer will pull them without needing to explicitely list them right?)

My goal is to be able to write something like this in our controllers:

class PersonController extends Controller {
    public function create(#[RequestPayload] PersonDto $person): DataResponse {
        // $person is already deserialized and valid at this point
    }
}

And that this then de serialize the json to this PersonDto and validate it against the specified constraints. This should remove some boilerplate and improve our server side validations. Also this is super helpful, for the ORM Entity to validate and serialize them.

The 4 dependencies are optional dependencies from serializer to be able to also support phpdoc comments like @param list<PersonDto> $persons. see https://symfony.com/doc/current/serializer.html#handling-arrays