Add a JS method to wipe current authentication

Our retool app has users login via their firebase account, using custom auth.

Logging in and refreshing the session works great. However, we would like to provide a "log out" button that would essentially wipe that user's custom auth magic variables, and allow them to log in with a different account.

Thanks for sharing! This definitely seems like a cool feature. I will raise this with the engineering team :grin: