TF-1068 implement data layer save recent login username & get all login username

lib/features/login/domain/model/recent_login_username.dart

@@ -0,0 +1,13 @@
+import 'package:equatable/equatable.dart';
+
+class RecentLoginUsername with EquatableMixin {
+  final String username;
+  final DateTime creationDate;
+
+  RecentLoginUsername(this.username, this.creationDate);
+
+  factory RecentLoginUsername.now(String username) => RecentLoginUsername(username, DateTime.now());
+
+  @override
+  List<Object?> get props => [ username, creationDate ];
+}