Vision macOS 12.0 Beta 1 to Beta 2 API Differences

VNDetectHumanHandPoseRequest.h
Removed #def VNHumanHandPoseObservationChirality
Removed #def VNHumanHandPoseObservationChiralityUnknown
Removed #def VNHumanHandPoseObservationChiralityLeft
Removed #def VNHumanHandPoseObservationChiralityRight