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

example/lib/widgets/controls.dart

@@ -149,6 +149,18 @@ class _ControlsWidgetState extends State<ControlsWidget> {
     }
   }
 
+  void _onTapSimulateScenario() async {
+    final result = await context.showSimulateScenarioDialog();
+    if (result != null) {
+      print('${result}');
+      await widget.room.simulateScenario(
+        nodeFailure: result == SimulateScenarioResult.nodeFailure ? true : null,
+        migration: result == SimulateScenarioResult.migration ? true : null,
+        serverLeave: result == SimulateScenarioResult.serverLeave ? true : null,
+      );
+    }
+  }
+
   void _onTapSendData() async {
     final result = await context.showSendDataDialog();
     if (result == true) {
@@ -238,6 +250,11 @@ class _ControlsWidgetState extends State<ControlsWidget> {
             icon: const Icon(EvaIcons.settings2),
             tooltip: 'Subscribe permission',
           ),
+          IconButton(
+            onPressed: _onTapSimulateScenario,
+            icon: const Icon(EvaIcons.alertTriangle),
+            tooltip: 'Simulate scenario',
+          ),
         ],
       ),
     );