Appointment type records now include a discussion area where users can leave comments and follow changes. This helps teams coordinate around appointment setup, request updates even without edit rights, and makes troubleshooting easier by tracking key field changes.

Add chatter on the appointment type model form to:
- make debugging easier (track some fields)
- allow big teams to cooperate
- allow users that cannot edit the type to leave comments ("can you add me?", ...)

Task-4160199