Session migration (#72)

* impl

* retry logic

* simulate

* pass checks

* adjust log level

* retry condition

* fix simulate scenario params

* format

* use `RTCPeerConnectionState` instead of `RTCIceConnectionState`

* adjust retry

* additional check for completer

* more logging

* fix id

* pub

* change package

* doc update

* retry tests

* format

* apply suggestions

lib/src/publication/local.dart

@@ -80,4 +80,10 @@ class LocalTrackPublication<T extends LocalTrack> extends TrackPublication<T> {
       logger.fine('Update publishing layers: nothing to change');
     }
   }
+
+  lk_rtc.TrackPublishedResponse toPBTrackPublishedResponse() =>
+      lk_rtc.TrackPublishedResponse(
+        cid: track?.mediaStreamTrack.id,
+        track: latestInfo,
+      );
 }

lib/src/publication/track_publication.dart

@@ -48,6 +48,9 @@ abstract class TrackPublication<T extends Track> extends Disposable {
 
   bool get subscribed => track != null;
 
+  @internal
+  lk_models.TrackInfo? latestInfo;
+
   TrackPublication({
     required lk_models.TrackInfo info,
   })  : sid = info.sid,
@@ -69,6 +72,7 @@ abstract class TrackPublication<T extends Track> extends Disposable {
     if (info.type == lk_models.TrackType.VIDEO) {
       _dimensions = VideoDimensions(info.width, info.height);
     }
+    latestInfo = info;
   }
 
   // Equality operators