feat(Other): Add Remote Config support (#7895)

Author: Mike Diarmid

packages/app/lib/internal/web/firebaseRemoteConfig.js

@@ -0,0 +1,6 @@
+// We need to share firebase imports between modules, otherwise
+// apps and instances of the firebase modules are not shared.
+import 'firebase/app';
+export { getApp } from 'firebase/app';
+export * from 'firebase/remote-config';
+export { makeIDBAvailable } from './memidb';