Add NoAutoSubscribe to peer.JoinConfig.

[cloudwebrtc]

Description

Do not subscribe to any stream during peer join, so that the application layer can perform fine control and subscribe on-demand

1, Listen publisher.OnPublishTrack event, generate StreamEvent and broadcast to each peer.

peer.Publisher().OnPublisherTrack(func(track ion_sfu.PublisherTrack) {
    log.Debugf("peer.OnPublisherTrack: \nKind %v, \nUid: %v,  \nMsid: %v,\nTrackID: %v",
                       track.Track.Kind(),
                       uid, 
                       track.Track.Msid(), 
                       track.Track.ID())
    // event := &rtc.StreamEvent{.....}
    // sig.BroadcastStreamEvent(event)
})

2,Peer uses the trackIds in StreamEvent to subscribe or unsubscribe.

case *rtc.UpdateSettings_Subcription:

subscription := payload.UpdateSettings.GetSubcription()
enabled := subscription.GetSubscribe()

for _, trackId := range subscription.TrackIds {

	if enabled {
                 // Add down tracks
		for _, p := range peer.Session().Peers() {
			for _, track := range p.Publisher().PublisherTracks() {
				if track.Receiver.TrackID() == trackId {
					peer.Publisher().GetRouter().AddDownTrack(peer.Subscriber(), track.Receiver)
				}
			}
		}
	} else {
               // Remove down tracks
		for streamID, downTracks := range peer.Subscriber().DownTracks() {
			for _,  track := range downTracks {
				if track.ID() == trackId {
					peer.Subscriber().RemoveDownTrack(streamID, track)
                                          track.Stop()
				}
			}
		}
	}

}

peer.Subscriber().Negotiate()

[adwpc]

LGTM. seems no break changes

[codecov]

Codecov Report

Merging #558 (c92f06a) into master (efaa0b7) will decrease coverage by 0.44%.
The diff coverage is 34.18%.

@@            Coverage Diff             @@
##           master     #558      +/-   ##
==========================================
- Coverage   40.24%   39.80%   -0.45%     
==========================================
  Files          23       23              
  Lines        2430     2437       +7     
==========================================
- Hits          978      970       -8     
- Misses       1324     1336      +12     
- Partials      128      131       +3     

Impacted Files	Coverage Δ
pkg/buffer/buffer.go	37.32% <ø> (ø)
pkg/buffer/factory.go	0.00% <0.00%> (ø)
pkg/buffer/helpers.go	36.47% <0.00%> (ø)
pkg/logger/helpers.go	17.39% <ø> (-11.19%)	⬇️
pkg/sfu/sfu.go	48.21% <0.00%> (-0.88%)	⬇️
pkg/sfu/router.go	47.97% <10.00%> (-0.85%)	⬇️
pkg/sfu/publisher.go	30.20% <14.28%> (-1.23%)	⬇️
pkg/logger/zerologr.go	37.50% <29.72%> (-8.66%)	⬇️
pkg/sfu/downtrack.go	31.62% <33.33%> (-1.01%)	⬇️
pkg/sfu/peer.go	54.16% <33.33%> (-0.54%)	⬇️
... and 5 more

---

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[cloudwebrtc]

@OrlandoCo updated