Added callback to manipulate FileAdder when performing a copy

[chrispage1]

This feature adds the ability to customise the FileAdder options when performing a copy action.

In my case, the requirement for this is to set properties against the media item, but it gives the user access to all of the FileAdder methods. Example:

use Spatie\MediaLibrary\MediaCollections\FileAdder;;

$media->copy(
    $postModel,
    fileAdderCallback: fn (FileAdder $adder): FileAdder => $adder->withProperties([
        'duplicate_of' => $oldMedia->getKey(),
    ])
);

Thanks!

[freekmurze]

Thank you!