useUser in auth-helper need to update `is_anonymous` key doesn't exist.

Recently, signInAnonymously function have been added. There are a few issue at the moment.

1. there is no documentation of how to enable signInanonymously locally. I need to push all functions to test in staging site. (not the end of the world but better to be able to test locally).
2. I'm finding a way to check if user is anonymous by using useUser from auth-helper-react in my case. The user object that return from this function call got is_anonymous key. But I can't access is_anonymous in the code base. screen shot as follows.

Hope this is helpful.

ps. user?.user_metadata.is_anonymous doesn't work return undefined.
ps2. current work around. check for anonymous user by check user?.email === ""

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