Added Performance overlays in developer options

lib/storage/devTools/devToolsSettings.dart

@@ -0,0 +1,15 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'devToolsSettings.g.dart';
+
+@JsonSerializable()
+class DevToolsSettings {
+  bool showPerformanceOverlay;
+  bool checkerboardOffscreenLayers;
+  bool checkerboardRasterCacheImages;
+
+  DevToolsSettings({required this.showPerformanceOverlay, required this.checkerboardOffscreenLayers, required this.checkerboardRasterCacheImages});
+
+  factory DevToolsSettings.fromJson(Map<String, dynamic> json) => _$DevToolsSettingsFromJson(json);
+  Map<String, dynamic> toJson() => _$DevToolsSettingsToJson(this);
+}

lib/storage/devTools/devToolsSettings.g.dart

@@ -0,0 +1,22 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'devToolsSettings.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+DevToolsSettings _$DevToolsSettingsFromJson(Map<String, dynamic> json) =>
+    DevToolsSettings(
+      showPerformanceOverlay: json['showPerformanceOverlay'] as bool,
+      checkerboardOffscreenLayers: json['checkerboardOffscreenLayers'] as bool,
+      checkerboardRasterCacheImages:
+          json['checkerboardRasterCacheImages'] as bool,
+    );
+
+Map<String, dynamic> _$DevToolsSettingsToJson(DevToolsSettings instance) =>
+    <String, dynamic>{
+      'showPerformanceOverlay': instance.showPerformanceOverlay,
+      'checkerboardOffscreenLayers': instance.checkerboardOffscreenLayers,
+      'checkerboardRasterCacheImages': instance.checkerboardRasterCacheImages,
+    };