Fix: Visibility Optimization randomly not working (#65)

* use widget id instead of state id

* ignore local video view events

* switch remote view visibility also

* use Key for a reliable id

* remove local check

* clean up

* redesign

* check mounted

* remove mount check

* more optimization

* quick wake up

* mark internal

* rename to adaptiveStream

lib/src/internal/events.dart

@@ -1,6 +1,5 @@
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 import 'package:meta/meta.dart';
-import 'package:visibility_detector/visibility_detector.dart';
 
 import '../events.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
@@ -59,18 +58,6 @@ class TrackStreamUpdatedEvent with TrackEvent, InternalEvent {
   });
 }
 
-@internal
-class TrackVisibilityUpdatedEvent with TrackEvent, InternalEvent {
-  final String rendererId;
-  final Track track;
-  final VisibilityInfo? info; // null means disposed
-  const TrackVisibilityUpdatedEvent({
-    required this.rendererId,
-    required this.track,
-    required this.info,
-  });
-}
-
 // Used to notify muted state from Track to TrackPublication.
 @internal
 class InternalTrackMuteUpdatedEvent with TrackEvent, InternalEvent {

lib/src/internal/types.dart

@@ -1,22 +1,5 @@
-import 'dart:ui';
-
 import 'package:meta/meta.dart';
 
-@internal
-@immutable
-class RendererVisibility {
-  final String rendererId;
-  final String trackId;
-  final bool visible;
-  final Size size;
-  const RendererVisibility({
-    required this.rendererId,
-    required this.trackId,
-    required this.visible,
-    required this.size,
-  });
-}
-
 @internal
 @immutable
 class RTCOfferOptions {