Subscriber as primary (#8)

* Update protos

* Signal client

* Improve transport

* First implementation

* Fix publish

* Update `PCTransport` for debounce negotiation

* debounce func

* reconnect & events

* Update debounce func

* engine events

* make sure events don't emit after dispose

* prefix flutter_webrtc

* Cleaner `iceServers` update

* don't mutate user provided params

* fix tests

* event manager

* Fix: `Room.onDisconnected` gets fired multiple times

* data publish in example

* cleaner logic

* safer events

* un-prefix with LK

* organize imports

* Clean up

* remove `Tuple`

* `EventsEmitter` can now be directly listened to

`EventsEmitter` extends `EventsListenable`

lib/src/participant/remote_participant.dart

@@ -1,4 +1,4 @@
-import 'package:flutter_webrtc/flutter_webrtc.dart';
+import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 
 import '../logger.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
@@ -35,7 +35,11 @@ class RemoteParticipant extends Participant {
 
   /// for internal use
   /// {@nodoc}
-  void addSubscribedMediaTrack(MediaStreamTrack mediaTrack, MediaStream stream, String? sid) async {
+  void addSubscribedMediaTrack(
+    rtc.MediaStreamTrack mediaTrack,
+    rtc.MediaStream stream,
+    String? sid,
+  ) async {
     if (sid == null) {
       const msg = 'addSubscribedMediaTrack received null sid';
       delegate?.onTrackSubscriptionFailed(this, '', msg);