fix(eventmodule): bind the event manager in singleton scope

Otherwise inversify would create a new EventManager for each request

Author: YannickFricke

src/container/modules/EventModule.ts

@@ -5,7 +5,9 @@ import { EventManager } from '../../event/EventManager';
 export class EventModule extends ContainerModule {
     constructor() {
         super((bind) => {
-            bind(ContainerConstants.SYSTEMS.EVENT.EVENTMANAGER).to(EventManager);
+            bind(
+                ContainerConstants.SYSTEMS.EVENT.EVENTMANAGER,
+            ).to(EventManager).inSingletonScope();
         });
     }
 }