Viewable Calendar

Add a calendar view to see the currently scheduled meetings. This will allow people to see if there are upcoming meetings they are interested in and want to join. Should include a way to have the meeting invite sent to the user if they want to attend.

Start by reviewing the Viewable Calendar issue and the azure-sdk-tools repository to identify the existing meeting-scheduling entry points. Define the calendar view, upcoming-meeting display, attendance flow, and meeting-invite behavior before implementation. Done means users can see scheduled meetings and request an invite for a meeting they want to attend.

Written by the indexing model from the issue text.