Feat/maintenance window controller (#475)

* Added createMaintenanceWindow route

* Added getMaintenanceWindowsByUserId

* Added getMaintenaceWindowsByMonitorId method, updated routes

* Exported delete methods

Server/utils/messages.js

@@ -78,6 +78,10 @@ const successMessages = {
   //Job Queue
   JOB_QUEUE_DELETE_JOB: "Job removed successfully",
   JOB_QUEUE_OBLITERATE: "Queue OBLITERATED!!!",
+
+  //Maintenance Window Controller
+  MAINTENANCE_WINDOW_CREATE: "Maintenance Window created successfully",
+  MAINTEANCE_WINDOW_GET_BY_USER: "Got Maintenance Windows by User successfully",
 };
 
 module.exports = {