Add "source inbox" to the event payloads for Move events
As a developer I sometimes need to see the source inbox of a move (i.e. see which inbox a conversation was moved from in addition to the inbox it was moved to.
Instead of "From 9 to 5 from Mon to Fri", be able to say "From 9 to 5 from Mon to Fri, except on Dec 25, Jan 1, etc". This allows to take plan for holidays, teammate PTOs, company events, etc.