TF-1014: [Dev] Show quota at the bottom of mailbox

lib/features/quotas/domain/model/exceptions/quotas_exception.dart

@@ -0,0 +1,3 @@
+class NotFoundQuotasException implements Exception {
+  NotFoundQuotasException();
+}

lib/features/quotas/domain/model/quotas_response.dart

@@ -0,0 +1,30 @@
+import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/state.dart';
+import 'package:jmap_dart_client/jmap/quotas/quota.dart';
+
+class QuotasResponse with EquatableMixin {
+  final AccountId accountId;
+  final State state;
+  final List<Quota> quotas;
+  final List<Id>? notFound;
+
+  QuotasResponse({
+    required this.accountId,
+    required this.state,
+    required this.quotas,
+    this.notFound,
+  });
+
+  bool hasData() {
+    return quotas.isNotEmpty;
+  }
+
+  @override
+  List<Object?> get props => [
+    quotas,
+    state,
+    notFound,
+  ];
+}