Stores a newly created passkey for the signed-in user.
The `challengeId` returned by `getPasskeyRegistrationOptions()`.
The W3C `RegistrationResponseJSON` credential produced by the authenticator.
// @_spi(Experimental) import Supabase
let passkey: PasskeyListItem = try await supabase.auth.verifyPasskeyRegistration(
challengeId: options.challengeId,
credentialResponse: credential
)