Add support for Apple's nonce_supported claim #841
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Description
Apple's authentication identity token can contain a non-standard nonce_supported claim.
As specified, by Apple when this claim is set to false the nonce check shall be skipped.
https://developer.apple.com/documentation/sign_in_with_apple/sign_in_with_apple_rest_api/authenticating_users_with_sign_in_with_apple
Testing
The unit test
option-nonce-supported.test.js
covers all four cases of the changed conditional.Checklist