Implemented cooldown before User is able to resend confirmation code for 2fa

frontend/pshared/lib/api/responses/confirmation.dart

@@ -0,0 +1,26 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'confirmation.g.dart';
+
+@JsonSerializable()
+class ConfirmationResponse {
+  @JsonKey(name: 'ttl_seconds', defaultValue: 0)
+  final int ttlSeconds;
+  @JsonKey(name: 'cooldown_seconds', defaultValue: 0)
+  final int cooldownSeconds;
+  @JsonKey(defaultValue: '')
+  final String destination;
+
+  const ConfirmationResponse({
+    required this.ttlSeconds,
+    required this.cooldownSeconds,
+    required this.destination,
+  });
+
+  Duration get cooldownDuration => Duration(seconds: cooldownSeconds);
+  Duration get ttlDuration => Duration(seconds: ttlSeconds);
+
+  factory ConfirmationResponse.fromJson(Map<String, dynamic> json) => _$ConfirmationResponseFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ConfirmationResponseToJson(this);
+}