[Protocol v7] Remote unpublish & expose permissions (#101)

* fix

* impl

* oldPermissions

* mods

lib/src/types/other.dart

@@ -13,6 +13,7 @@ enum ProtocolVersion {
   v4,
   v5,
   v6, // Session migration
+  v7, // Remote unpublish
 }
 
 /// Connection state type used throughout the SDK.

lib/src/types/participant_permissions.dart

@@ -0,0 +1,30 @@
+import 'package:meta/meta.dart';
+
+import '../proto/livekit_models.pb.dart' as lk_models;
+
+@immutable
+class ParticipantPermissions {
+  final bool canSubscribe;
+  final bool canPublish;
+  final bool canPublishData;
+  final bool hidden;
+  final bool recorder;
+
+  const ParticipantPermissions({
+    this.canSubscribe = false,
+    this.canPublish = false,
+    this.canPublishData = false,
+    this.hidden = false,
+    this.recorder = false,
+  });
+}
+
+extension ParticipantPermissionExt on lk_models.ParticipantPermission {
+  ParticipantPermissions toLKType() => ParticipantPermissions(
+        canSubscribe: canSubscribe,
+        canPublish: canPublish,
+        canPublishData: canPublishData,
+        hidden: hidden,
+        recorder: recorder,
+      );
+}