[FEATURE] Egress API: New method StartAutoEgress

[coonmoo]

Problem

We want to automatically record all current and future published audio tracks in a room when a user of our app requests a recording. Currently we are only able to do that if we specify the egress parameter (Auto Egress) when creating a room.

Therefore we always have egress requests running even if we do not need the recording.

Solution

Introduce a new Egress API method StartAutoEgress which would allow us to start the Auto Egress on demand.

Note: We are not able to use the TrackEgress API as our server infrastructure can not use the Livekit client or the Webhooks feature to listen to track published events to start the individual track egress request.