Implemented structure for push Notifications

lib/storage/notification/notificationSettings.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'notificationSettings.g.dart';
+
+@JsonSerializable()
+class NotificationSettings {
+  bool askUsageDismissed;
+  bool enabled;
+
+  NotificationSettings({required this.askUsageDismissed, required this.enabled});
+
+  factory NotificationSettings.fromJson(Map<String, dynamic> json) => _$NotificationSettingsFromJson(json);
+  Map<String, dynamic> toJson() => _$NotificationSettingsToJson(this);
+}

lib/storage/notification/notificationSettings.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'notificationSettings.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+NotificationSettings _$NotificationSettingsFromJson(
+        Map<String, dynamic> json) =>
+    NotificationSettings(
+      askUsageDismissed: json['askUsageDismissed'] as bool,
+      enabled: json['enabled'] as bool,
+    );
+
+Map<String, dynamic> _$NotificationSettingsToJson(
+        NotificationSettings instance) =>
+    <String, dynamic>{
+      'askUsageDismissed': instance.askUsageDismissed,
+      'enabled': instance.enabled,
+    };