TF-123 Create objects for caching mailbox

model/lib/caching/state/state_dao.dart

@@ -0,0 +1,21 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:hive/hive.dart';
+import 'package:model/model.dart';
+
+part 'state_dao.g.dart';
+
+@HiveType(typeId: CachingConstants.STATE_DAO_IDENTIFY)
+class StateDao extends HiveObject with EquatableMixin {
+
+  @HiveField(0)
+  final StateType type;
+
+  @HiveField(1)
+  final String state;
+
+  StateDao(this.type, this.state);
+
+  @override
+  List<Object?> get props => [type, state];
+}

model/lib/caching/state/state_type.dart

@@ -0,0 +1,21 @@
+
+import 'package:hive/hive.dart';
+import 'package:model/model.dart';
+
+part 'state_type.g.dart';
+
+@HiveType(typeId: CachingConstants.STATE_TYPE_IDENTIFY)
+enum StateType {
+
+  @HiveField(0)
+  mailbox
+}
+
+extension StateTypeExtension on StateType {
+  String get value {
+    switch(this) {
+      case StateType.mailbox:
+        return 'mailbox';
+    }
+  }
+}