move internal types

lib/src/internal/types.dart

@@ -0,0 +1,18 @@
+
+import 'dart:ui';
+
+import 'package:meta/meta.dart';
+
+@internal
+class RendererVisibility {
+  final String rendererId;
+  final String trackId;
+  final bool visible;
+  final Size size;
+  RendererVisibility({
+    required this.rendererId,
+    required this.trackId,
+    required this.visible,
+    required this.size,
+  });
+}