add mock in-memory data service

src/app/api-utils.ts

@@ -1,5 +1,7 @@
+import { environment } from '../environments/environment'
+
 export const deviceID = (): String => {
-    const dID: String = globalThis.metadata['deviceID'];
+    const dID: String = environment.production ? globalThis.metadata['deviceID'] : '12345';
     return dID.substring(0, 5)
 }