Missing AuthenticationError helper for Revoked tokens

[lordzsolt]

Checklist

• [X] The issue can be reproduced in the Auth0.swift sample app (or N/A).
• [X] I have looked into the Readme, Examples, and FAQ and have not found a suitable solution or answer.
• [X] I have looked into the API documentation and have not found a suitable solution or answer.
• [X] I have searched the issues and have not found a suitable solution or answer.
• [X] I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• [X] I agree to the terms within the Auth0 Code of Conduct.

Description

When a refresh token is invalidated remotely, when attempting to obtain a new access token using this refresh token, Auth0 will reply with:

{
    "error": "invalid_grant",
    "error_description": "Unknown or invalid refresh token."
}

This case does not exist in Auth0.swift, but exists in Auth0.android: https://github.com/auth0/Auth0.Android/blob/148df396c5706579b99bb7a1d26e00ea65a93753/auth0/src/main/java/com/auth0/android/authentication/AuthenticationException.kt#L204C16-L204C37

---

I would expect AuthenticationError to contain isInvalidRefreshToken same as Auth0.Android.

Reproduction

1. Log in with a user
2. Find the user in the Auth0 management: UserManagement -> Users -> YOUR_USER
3. Devices
4. Delete your device, revoking the refresh token
5. Attempt to get a new access token using CredentialsManager.credentials (calls oauth/token)
6. Notice the returned error

Additional context

No response

Auth0.swift version

2.5.0

Platform

iOS

Platform version(s)

17.0

Xcode version

15.1

Package manager

Cocoapods