This interactor allows sending use-strength values to an interactable to create use interactions.

e.g. Pressing a trigger, squeezing a ball, etc. In order to calculate the usage strength of a finger it uses a IFingerUseAPI. This class is also an IHandGrabState, so it can be attached to a SyntheticHand to drive the fingers rotations, it will lerp between the RelaxedHandGrabPose and TightHandGrabPose provided by the interactable depending on the progress of the action.