Sean

Implement cookie persistence

1

The ForwardingCookieHandler has a [`persistCookies`](https://github.com/facebook/react-native/blob/123512c5deb797759fd653f5a336b433013e83b5/ReactAndroid/src/main/java/com/facebook/react/modules/network/ForwardingCookieHandler.java#L212) method which calls the CookieManager's [`flush`](https://developer.android.com/reference/android/webkit/CookieManager#flush()) method which writes the available cookies to disk. This looks like it could be added fairly easily to the...