feat: Forward leave reason of disconnected events. (#250)

* feat: Forward leave reason of disconnected events.

* fix analyze.

* chore: print room disconnect reason when event.reason != null.

* chore: rename InternalDisconnectReason => ClientDisconnectReason.

lib/src/internal/events.dart

@@ -247,8 +247,10 @@ class EngineActiveSpeakersUpdateEvent with EngineEvent, InternalEvent {
 @internal
 class SignalLeaveEvent with SignalEvent, InternalEvent {
   final bool canReconnect;
+  final lk_models.DisconnectReason reason;
   const SignalLeaveEvent({
     required this.canReconnect,
+    required this.reason,
   });
 }