feat: Add map eventhandlerset event

Would be used isntead of mapService.loaded to register layers

projects/hslayers/shared/event-bus/event-bus.service.ts

@@ -1,4 +1,4 @@
-import {BehaviorSubject, Subject} from 'rxjs';
+import {BehaviorSubject, ReplaySubject, Subject} from 'rxjs';
 import {Injectable} from '@angular/core';
 
 import {Feature, Map} from 'ol';
@@ -113,6 +113,7 @@ export class HsEventBusService {
     event: string;
     extent: number[];
   }> = new Subject();
+  mapEventHandlersSet: ReplaySubject<void> = new ReplaySubject();
   mapCenterSynchronizations: Subject<any> = new Subject();
   mapLibraryChanges: Subject<any> = new Subject();
   /**

projects/hslayers/shared/layer-manager/layer-manager.service.ts

@@ -223,6 +223,7 @@ export class HsLayerManagerService {
       onLayerRemove,
       onResolutionChange,
     ];
+    this.hsEventBusService.mapEventHandlersSet.next();
   }
 
   /**