List support messages

Returns messages sent to Brix through the contact endpoint, newest first, up to a capped number of results. A caller with screen.view for the whole workspace gets all of the workspace's messages. Any other caller gets only the messages they sent.

Notes.

• Newest first, at most 200. A caller without screen.view for the whole workspace gets only the messages sent from their own email address, so an API key limited to a location always gets an empty list.