Option to unpublish without stopping track (#45)

* implement

* rename

* only for local

* keep option

* no per unpublish option to stop track

* format

* format

lib/src/options.dart

@@ -20,11 +20,16 @@ class ConnectOptions {
   /// defaults to true.
   final bool optimizeVideo;
 
+  /// Set this to false in case you would like to stop the track yourself.
+  /// defaults to true.
+  final bool stopLocalTrackOnUnpublish;
+
   const ConnectOptions({
     this.autoSubscribe = true,
     this.defaultVideoPublishOptions = const VideoPublishOptions(),
     this.defaultAudioPublishOptions = const AudioPublishOptions(),
     this.optimizeVideo = true,
+    this.stopLocalTrackOnUnpublish = true,
   });
 }
 

lib/src/participant/local_participant.dart

@@ -188,7 +188,9 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
 
     final track = pub.track;
     if (track != null) {
-      await track.stop();
+      if (engine.connectOptions.stopLocalTrackOnUnpublish) {
+        await track.stop();
+      }
 
       final sender = track.transceiver?.sender;
       if (sender != null) {