e2e: fix resume/full-reconnect. (#194)

* fix: full re-connect.

* chore: Reset fullReConnect state after ConnectionState is emitted.

* Support full reconnect, fix Migration, NodeFailure, FullReconnect test cases.

* revert Timeouts.connection.

* update.

* Refactor the resume/reconnect implementation.

* more changes.

* update.

* Changed to simpler reconnect/recovery logic.

* update.

* update.

* code format.

* tidy.

* bump version for flutter-webrtc.

* chore: Remove unused exception class (SignalReconnectError).

* chore: rename `fullReconnectOnNext` to `fullReconnect`.

* update.

* chore: Revert changes for `unpublishTrack`.

* chore: Reconnect signalClient when resumeConnection.

* revert `rethrow` in engine.connect.

* Use removePublishedTrack instead of unpublishTrack (RemoteParticipant).

* chore: Correctly handle PeerConnectionState for resume/full-reconnect.

* tidy.

example/lib/widgets/controls.dart

@@ -219,6 +219,8 @@ class _ControlsWidgetState extends State<ControlsWidget> {
     if (result != null) {
       print('${result}');
       await widget.room.sendSimulateScenario(
+        signalReconnect:
+            result == SimulateScenarioResult.signalReconnect ? true : null,
         nodeFailure: result == SimulateScenarioResult.nodeFailure ? true : null,
         migration: result == SimulateScenarioResult.migration ? true : null,
         serverLeave: result == SimulateScenarioResult.serverLeave ? true : null,