Unload relationship after autoload for toArray()

[beschoenen]

This makes sure that translations is removed from the model after toArray() is called, so it doesn't appear in any API responses.

This option is opt-in and therefor backwards compatible.

[Gummibeer]

Hey,
thanks for your PR but as I strongly disagree with return $model->toArray() as a good way to build APIs and I would have to maintain that one over the next years I don't want to merge it in.
Laravel comes with a great way to define the array scheme for API responses: https://laravel.com/docs/11.x/eloquent-resources
And using these there's no problem in having the relationship loaded. In worst case that new behavior would also result in unwanted multipe queries as I probably call toArray() to transform my model in a DTO and after that access $model->title (translated attribute) directly which will again load the relationship as the toArray() has already loaded but immediately unset it.