Move a python module to call DIO via rosservice.

Copied from https://github.com/ros-japan-users/nextage_hardware_service

Thanks to the work from `ros-japan-users` esp. @akio @youtalk @DaikiMaekawa. Shoot me if anything missing (copyright, license etc.) I/someone can integrate this into the official tutorial later when I have a chance to work with the real robot.