Support any revisionable entity types

Added additional config and field on the settings form to allow selection of any revisionable entity types on the site.

Moving to NR as I cannot really test it due to https://www.drupal.org/project/revision_cleanup/issues/3487627#comment-1... ✨ Optimize for sites with large number of entities. Active . I see some other references to 'nid' so cannot be sure whether this works yet.