It seems that there is no token specified for user

**Describe the bug**
I want to auth with Firebase and then use token - to store and retrieve data from firebase for authenticated users.
It seems that user object does not contain token.

**To Reproduce**
Steps to reproduce the behavior:
1. Auth via Google or Email-password
2. Check user object returned
3. There is no token

**Expected behavior**
Token property is shown there

There is a workaround - to useEffect() for user change. Then add property to the user with
firebase.auth().currentUser.getIdToken(/* forceRefresh */ true).then(function(idToken) {
// Send token to your backend via HTTPS
// ...
}).catch(function(error) {
// Handle error
});

Start by tracing the user object exposed by the authentication higher-order component and compare it with the Firebase user returned after Google and email-password sign-in. Verify whether the token is expected to be part of that object or must be retrieved separately, then confirm the chosen behavior for both authentication flows.

Written by the indexing model from the issue text.