To make it easier to configure which HID implementation - and which parts of it
- a particular board uses, we turn our current HID facade (`kaleidoscope::hid`)
into a proper, Props-supported driver. This also allows us to get rid of the
`Kaleidoscope-HIDAdaptor-KeyboardioHID` library.
Signed-off-by: Gergely Nagy <algernon@keyboard.io>