Add firebase anonymous authentication option

[ericrav]

Closes #6496

Allows Firebase auth users to call

logIn({ providerId: 'anonymous' })

and call firebaseAuth.signInAnonymously(auth) under the hood

https://firebase.google.com/docs/auth/web/anonymous-auth

[replay-io]

10 replays were recorded for 76b4213.

0 Failed

10 Passed

• requireAuth graphql checks
• useAuth hook, auth redirects checks
• RBAC: Admin user should be able to delete contacts
• RBAC: Should not be able to delete contact as non-admin user
• Smoke test with dev server
• Smoke test with rw serve
• Loads Cell mocks when Cell is nested in another story
• Loads Cell Stories
• Loads MDX Stories
• Mocks current user, and updates UI while dev server is running

View test run on Replay ↗︎

[Tobbe]

I'm trying to reproduce this issue, but facing some issues

I'll keep trying. Just so everyone knows this issue isn't being ignored 🙂

EDIT: firebase/firebase-js-sdk#6660
EDIT 2: I created an issue for this #6618
EDIT 3: A manual "resolutions" field in package.json to downgrade to firebase 9.10.0 allowed me to verify that this PR works.