Add channel to meeting to save recordings centrally to team

Talking with the Teams team, if we want to save recordings and transcripts centrally from the REST API Stewardship Board meetings, we need to add the channel to the Teams meeting. When we did this in the past, we also found that people not in the Teams team couldn't access the chat until they were added; thus, we may also need the app to add those members to the team unless I can find a way to permit all our tenant/enterprise (still discussing).

* Schedule meeting: https://learn.microsoft.com/graph/api/application-post-onlinemeetings
I don't see, however, how to add a channel but this is possible in the UI:

* Add members in bulk (1.._N_): https://learn.microsoft.com/graph/api/conversationmembers-add

/cc @tg-msft @mikekistler

Start with the Microsoft Graph online meeting scheduling endpoint linked in the issue and investigate how the UI associates a channel with a meeting. Then review the linked conversation-members endpoint and determine whether adding non-team members is required. Done means recordings and transcripts are centrally accessible and intended attendees can access the meeting chat.

Written by the indexing model from the issue text.