Event updates: Option to send (or not send) update email on changes made to event record

Current State: integration with Google calendar sends update email to full invite list when any edit is made to event record (new time, edit to event copy, etc) -- this produces multiple emails to our audience

Future state: in the same way that google presents an option to send an update email to invitees, it would be helpful if the chezie/google cal integration also retained this feature - this way we can better manage the emails sent to our full audience whenever adjustments to events are made.