[php] support for method attributes

Method attributes are used by frameworks such as Symfony to specify routes and other information.

```php
// src/Controller/BlogController.php
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class BlogController extends AbstractController
{
#[Route('/blog', name: 'blog_list')]
public function list(): Response
{
// ...
}
}
```

https://www.php.net/manual/en/language.attributes.overview.php
https://symfony.com/doc/current/routing.html