Data transfer modifier: Allow face maps or material index as selected areas

Today there is no way to select areas for face corner data like UV coordinates or custom normals. If I use vertex groups for this, all face corners will be affected by the modifier.

I think it would make sense to allow face maps and materials to use as mask since they would allow for a more precise definition of what to select.

As an example, this could be useful when transferring UV coordinates, Materials or Normals to fractured meshes from a source.