Add a field to each of the media item types to allow users to assign the item to a Group so that:
If an item is assigned to a group
the item is not able to be found in the library, selected or edited by someone who is not a member of that group
Similar to article pages, only members of a group can add new items to that group (the select list field to add to a group only shows the list of that user’s groups)
Media items not assigned to any groups should remain subject to drupal’s overall permissions in terms of who can create/update/delete those items.
Add media types to the og_ui_form_alter
Needs review
1.0
og.module
I wonder if there's a better way of doing it with BundleEntityFormBase rather than specifically hardcoding for MediaTypeForm?