Problem in Phone Auth for Arabic Users

[ogantopkaya]

Numpad has different digits characters for Arabic keyboard. In phone number verification when we enter the verification code with those digits we get an error. We must prevent users from entering Arabic digits in that screen.

Env:
Lib: Firebase (v6.0.0), FirebaseAuth (v6.0.0), FirebaseCore (v6.0.0) and FirebaseUI (v8.2.0).
Deployment Target set to iOS 13.1.
iPhone 8 (v13.1).