add MarianumConnectQuery base and adopt it in list queries

lib/api/marianumconnect/queries/get_holidays/get_holidays.dart

@@ -1,25 +1,13 @@
-import 'package:dio/dio.dart';
-
-import '../../errors/marianumconnect_error.dart';
-import '../../marianumconnect_api.dart';
-import '../../marianumconnect_endpoint.dart';
+import '../../marianumconnect_query.dart';
 import '../../models/mc_holiday.dart';
 
-class GetHolidays {
-  final Dio _dio;
+class GetHolidays extends MarianumConnectQuery {
+  GetHolidays({super.dio});
 
-  GetHolidays({Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
-
-  Future<List<McHoliday>> run() async {
-    try {
-      final response = await _dio.get<List<dynamic>>(
-        MarianumConnectEndpoint.resolve('holidays'),
-      );
-      return response.data!
-          .map((e) => McHoliday.fromJson(e as Map<String, dynamic>))
-          .toList();
-    } on DioException catch (e) {
-      throw mapMarianumConnectError(e);
-    }
-  }
+  Future<List<McHoliday>> run() => guard(() async {
+    final response = await dio.get<List<dynamic>>(endpoint('holidays'));
+    return response.data!
+        .map((e) => McHoliday.fromJson(e as Map<String, dynamic>))
+        .toList();
+  });
 }