Support for real_user_status

[prateekj117]

Apple introduced a real_user_status which is not returned by apple-sign-in-rest. You can find more about it here.

Here's a gist of it:

real_user_status:
An Integer value that indicates whether the user appears to be a real person. Use the value of this claim to mitigate fraud. The possible values are: 0 (or Unsupported), 1 (or Unknown), 2 (or LikelyReal). For more information, see [ASUserDetectionStatus](https://developer.apple.com/documentation/authenticationservices/asuserdetectionstatus). This claim is present only on iOS 14 and later, macOS 11 and later, watchOS 7 and later, tvOS 14 and later; the claim isn’t present or supported for web-based apps.

Will push a PR regarding this.