Ability to see which staff member edited or deleted a Connect post while impersonating a member

Staff can impersonate a member to edit or delete that member's Connect topics and replies, but those changes aren't recorded anywhere, so there's no way to tell afterward who changed or removed a post, or when.

Log each edit and delete on Connect topics and replies (what changed, when, and the staff member behind an impersonation) and show that history on the member's record, so staff can audit moderation actions.