Add the ability to use hand/finger tracking when holding controllers natively or when using Link cable.

Sign language with friends would become a lot easier if this was added. Currently, making hand signs like holding three fingers up or slightly curving your fingers is impossible when using apps such as VRChat. If this was added to Quest 2 and Quest, this could them be added by applications and would make it a lot easier for the sign community to converse in Virtual Reality.