RN 0.59: Avoid AsyncStorage warning by re-wrap the native module

[jhen0409]

Since we used AsyncStorage to made context menu functions of RNDebugger, it caused the warning in RN ^0.59:

ExceptionsManager.js:82 Warning: Async Storage has been extracted from react-native core and will be removed in a future release. It can now be installed and imported from '@react-native-community/async-storage' instead of 'react-native'. See https://github.com/react-native-community/react-native-async-storage

Just use NativeModules to re-wrap the module to avoid the warning. It also fixes the issue of AsyncStorage functions of context menu in future RN versions.