[Feature Request] Add GPIO Pin Control to Prusa Link for Raspberry Pi

[SchmidtPhilipp]

Please implement GPIO pin control within Prusa Link, enabling users to manage Raspberry Pi-connected peripherals, like LEDs or fans, during a 3D print. This feature would allow users to automate lighting for better print visibility or for capturing photos, as well as control other devices directly from the Prusa Link interface.

[Escrich]

The intention will be to be able to use gcode M42, and maybe M226 too