add copyright

src/AuthenticationStatus.php

src/Client-Autoloader.php

src/PIBadRequestException.php

src/PILog.php

test/PollTransactionTest.php

test/TriggerChallengeTest.php

test/ValidateCheckTest.php

test/ValidateCheckU2FTest.php

test/ValidateCheckWebauthnTest.php

test/utils/Utils.php