[Feature Request] Support HIDAuxiliaryDisplay and other HID display specs

[dzervas]

I came across this project that uses the HID spec for Auxiliary displays and I think it's exactly what ZMK needs in terms of displays. We don't have "a lot" of display widgets but allowing the host to do the heavy lifting is amazing. We already have some basic widgets that represent the state of the keyboard itself and we can leave the rest up to the host

This spec describes the handling of dot-matrix displays but there are other specs to handle character-only displays and more but as dot-matrix displays (the small oled ones) are the most popular it makes sense to start from there

EDIT: maybe there are HID specs to do even cooler stuff like changing the keymap? dunno