[12.x] Add support for #[UseResource(...)] and #[UseResourceCollection(...)] attributes on models

[Lukasss93]

This PR adds the possibility to define resource classes directly on a model using PHP attributes.

Background

Right now, toResource and toResourceCollection automatically resolve the resource class only if it follows the <ModelName>Resource naming convention.

In my project, I couldn’t follow the naming convention for resources.
As a result, I need to write calls like this everywhere:

$model->toResource(MyCustomNameResource::class);
$collection->toResourceCollection(MyCustomNameCollectionResource::class);

This gets repetitive and makes the code less clean.

What’s New

With this PR, developers can declare attributes on the model and let Laravel handle the resource resolution automatically:

use App\Http\Resources\MyCustomNameResource;
use App\Http\Resources\MyCustomNameCollectionResource;

#[UseResource(MyCustomNameResource::class)]
#[UseResourceCollection(MyCustomNameCollectionResource::class)]
class MyModel extends Model {}

Now you can simply call:

$model->toResource();
$collection->toResourceCollection();