Have HydratorInterface extend stdlib variant of ExtractionInterface
Have HydratorInterface extend stdlib variant of ExtractionInterface

This was needed to ensure that objects typehinting on
`Zend\Stdlib\Extractor\ExtractionInterface` specifically would continue to work
with objects implementing HydratorInterface. (Discovered in testing Apigility;
this one change makes Apigility work correctly.)

adamlundrigan/zend-stdlib,php-refactoring/zend-array-utility,MadCat34/zend-stdlib