Support Microsoft Teams Shorter meeting URLs

[JiandongRuan]

Please update the real time media sample to support joining Teams meetings using the shorter URL in the form of https://teams.microsoft.com/meet/meeting_id?p=HashedPasscode, as announced here and here. The new format is now the default for "Meet Now" and is being rolled out to meetings scheduled in calendar.

Note: Get onlineMeeting API can fetch the long URL format by the short version. But it requires delegated permission of the meeting owner, which we don't know from the shorter URL.

[InDieTasten]

@samarthasthana @ssulzer I think this really needs to be addressed urgently. The bogus AI PR #856 doesn't help. We don't necessarily need a sample, but we at least need a way. A documented way to join the meeting using the invite url.

Also, this is very much related to #829