hit_test library Null safety

WebXR Hit Test Module

https://immersive-web.github.io/hit-test/

Classes

XRHitTestOptionsInit
XRHitTestResult
XRHitTestSource
XRRay
XRRayDirectionInit
XRTransientInputHitTestOptionsInit
XRTransientInputHitTestResult
XRTransientInputHitTestSource

Enums

XRHitTestTrackableType