Allow disabling calendar notifications

This idea is related to https://front.ideas.aha.io/ideas/PRD-I-4204 from a technical perspective, but would solve a different 'problem'.

I don't use Front's calendar. We have the - very cool - Notifications section in our profile to control the notifications about our inbox, but no option to disable the calendar-related notifications. The only option is to block the notifications at the OS level, which obviously also blocks the ones I do want: those about my inbox.

In summary: I'd like an option to disable the desktop notifications related to calendar activities.