convert appid to abstract class

src/abstractions/appId.service.ts

@@ -1,4 +1,4 @@
-export interface AppIdService {
-    getAppId(): Promise<string>;
-    getAnonymousAppId(): Promise<string>;
+export abstract class AppIdService {
+    getAppId: () => Promise<string>;
+    getAnonymousAppId: () => Promise<string>;
 }

src/services/appId.service.ts

@@ -1,9 +1,9 @@
 import { UtilsService } from './utils.service';
 
-import { AppIdService as AppIdServiceInterface } from '../abstractions/appId.service';
+import { AppIdService as AppIdServiceAbstraction } from '../abstractions/appId.service';
 import { StorageService } from '../abstractions/storage.service';
 
-export class AppIdService implements AppIdServiceInterface {
+export class AppIdService implements AppIdServiceAbstraction {
     constructor(private storageService: StorageService) {
     }