feat: implmented first internal functions for KMS service

backend/e2e-test/mocks/keystore.ts

@@ -28,6 +28,7 @@ export const mockKeyStore = (): TKeyStoreFactory => {
     },
     acquireLock: () => {
       throw new Error("Not implemented");
-    }
+    },
+    waitTillReady: async () => {}
   };
 };