Get and set DDC/CI monitor info

[ttimasdf]

Description

A good example could be: xanderfrangos/twinkle-tray: Easily manage the brightness of your monitors in Windows from the system tray

Expose an API that could change monitor brightness and other settings (like, on/off toggle), which could be useful for Home Assistant and other integrations.

[ttimasdf]

Getting and setting SDR Content Brightness on HDR monitors is also planned, since brightness control is ineffective when HDR is enabled. But it may require further discussion since implementation may involves a C++ extension and direct manipulation through ctypes is a bit tricky.