Media Library widget

The settings form can have errors when another field gets added via ajax call. The form differs from core as we are handling both the field settings and media types table in single place so the evaluations within the getAllowedMediaTypeIdsSorted() function are getting screwy.

A side note is that it looked as if our "show table rows" link was duplicated but thats a gin theme issue addressed here: https://www.drupal.org/project/gin/issues/3468418 🐛 Nested Tables Result in Duplicate Weight Toggles RTBC