Renaming response fields in transformers

[guidodinello]

Hi! First of all, thank you for this great package.

I have a question/feature discussion: Is there currently any way to rename a field in the response when using transformers?

For example, let's say we have a model with a user_id field, but in the API response we want it to appear as userId. This is easy to handle for regular model properties:

public function transform(MyModel $model): array
{
    return [
        'userId' => $model->user_id,
        // other fields...
    ];
}

However, when dealing with relationships, it becomes trickier:

final class MyTransformer extends Transformer
{
    protected $relations = [
        'relatedEntity' => AnotherTransformer::class,
    ];

    public function transform(MyClass $myclass): array
    {
        return [
            'id' => $feedback->id,
            'createdAt' => $feedback->created_at,
            'updatedAt' => $feedback->updated_at,
        ];
    }
}

Is there currently a way to keep the relationship name as relatedEntity in the model but have it appear with a different name in the API response?

Maybe something like this:

final class MyTransformer extends Transformer
{
    protected $relations = [
        'relatedEntity' => AnotherTransformer::class,
    ];

    protected $renames = ['relatedEntity' => 'mappedName']

    public function transform(MyClass $myclass): array
    {
        return [
            'id' => $myclass->id,
            'createdAt' => $myclass->created_at,
            'updatedAt' => $myclass->updated_at,
        ];
    }
}

If this feature doesn't exist, I'd be happy to contribute a PR implementing it if you think it would be a valuable addition to the package.

Edit: Ive just found the config('responder.use_camel_case_relations'), so I guess we cant handle more custom renames.