FR (Docs): Missing Expo Snack for RN Authenticator "All Attributes"

### On which framework/platform would you like to see this feature implemented?

React Native

### Which UI component is this feature-request for?

Authenticator

### Please describe your feature-request in detail.

We don't have Expo embedded app for the "all attributes" code sample:

### Please describe a solution you'd like.

_No response_

### We love contributors! Is this something you'd be interested in working on?

- [ ] 👋 I may be able to implement this feature request.
- [ ] ⚠️ This feature might incur a breaking change.

Start with the React Native Authenticator documentation and the existing “all attributes” code sample referenced in the issue. Compare nearby embedded Expo examples and identify where the missing app should be added. Done means the “all attributes” sample has a working embedded Expo Snack.

Written by the indexing model from the issue text.