[Mobile - Canvas Student] Student App Calendar should include events from Groups (Course groups and Account groups)

[a_coombs]

At the moment, when using the web browser UI for Canvas, students can see a Calendar for their Course Groups and Account-level groups and events from these calendars are visible to them.

In the Student App, however, the Calendar function currently excludes all Group Calendars / Events (it only shows events from favourited courses)

This provides a confusing disparity of student experience depending on which UI they happen to be using at any one time, and at worst can lead them to miss an event.

It would be great if the Calendar in the Student App had parity of functionality with the calendar in the web browser UI.