[Feature Request] Support for /sys/class/leds devices on Linux

Feature Request

Linux has a standard spec for handling LEDs via the sysfs. This spec is available at https://docs.kernel.org/leds/leds-class-multicolor.html.

I would like that OpenRGB supports setting color values for LEDs present in the sysfs at /sys/class/leds. This would allow OpenRGB to be compatible with all keyboards supported by the Tuxedo Drivers, in particular the ITE keyboards from #720 (closed).

I currently use the sysfs interface directly, as documented at https://github.com/tuxedocomputers/tuxedo-keyboard/issues/204, but it feels clunky and is not practical.

If you need help testing, I am able to compile, run and help debugging.