Serializable data-only version of the HandGrabInteractable so it can be stored when they are generated at Play-Mode (where Hand-tracking works).
This can be used by Unity Editor-based tools such as the HandGrabPoseWizard in order to persist state collected during Play-Mode for use after that Play-Mode session.
Copy of the source interactor's HandGrabInteractable.PinchGrabRules; for details, please refer to the related documentation provided for that property.