DeviceCheck iOS 13.6 to 14.0 API Differences

DCAppAttestService.h

Added DCAppAttestService

Added DCAppAttestService.sharedService

Added DCAppAttestService.supported

Added -[DCAppAttestService generateKeyWithCompletionHandler:]

Added -[DCAppAttestService attestKey:clientDataHash:completionHandler:]

Added -[DCAppAttestService generateAssertion:clientDataHash:completionHandler:]

DCError.h

Added DCErrorInvalidInput

Added DCErrorInvalidKey

Added DCErrorServerUnavailable

DeviceCheck.h

Added #def DC_EXPORT