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/extensions.dart

@@ -42,6 +42,7 @@ extension ProtocolVersionExt on ProtocolVersion {
         ProtocolVersion.v3: '3',
         ProtocolVersion.v4: '4',
         ProtocolVersion.v5: '5',
+        ProtocolVersion.v6: '6',
       }[this]!;
 }
 
@@ -65,11 +66,9 @@ extension RTCIceCandidateExt on rtc.RTCIceCandidate {
   String toJson() => json.encode(toMap());
 }
 
-extension RTCIceConnectionStateExt on rtc.RTCIceConnectionState {
-  bool isConnected() => [
-        rtc.RTCIceConnectionState.RTCIceConnectionStateConnected,
-        rtc.RTCIceConnectionState.RTCIceConnectionStateCompleted,
-      ].contains(this);
+extension RTCPeerConnectionStateExt on rtc.RTCPeerConnectionState {
+  bool isConnected() =>
+      this == rtc.RTCPeerConnectionState.RTCPeerConnectionStateConnected;
 }
 
 extension RTCIceTransportPolicyExt on RTCIceTransportPolicy {
@@ -82,7 +81,7 @@ extension RTCIceTransportPolicyExt on RTCIceTransportPolicy {
 // not so neat to directly expose protobuf types so we
 // define our own types (and convert methods)
 extension RTCSessionDescriptionExt on rtc.RTCSessionDescription {
-  lk_rtc.SessionDescription toSDKType() {
+  lk_rtc.SessionDescription toPBType() {
     return lk_rtc.SessionDescription(type: type, sdp: sdp);
   }
 }