* Add HID report/descriptor for a new report with mouse buttons,
and x/y/wheel deltas.
* New mouse key press behavior for press/release of mouse keys.
* Add constants for HID main item values (e.g. data/array/absolute)
* Define and use constants for our HID report IDs.
* USB boot protocol support
* Use a single definition of a boot report, used for regular reports in
non-6KRO, and for rollover in all branches.
* Handle gaps in the zmk report when producing a boot report in HKRO mode. For
.example, if it was 8KRO, it would be possible to have the state 0 0 0 0 0 0 0
17 (by pressing 8 keys, and letting go of the first 7). Copying the first 6
bytes would not show up the single pressed key.
* Disable usb status change and callback on SOF events:
SOF events were introduced by the boot protocol changes, and required internally
by Zephyr's idle support, but are unused within ZMK itself. Ignore them in the
usb status callback.
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Co-authored-by: Andrew Childs <lorne@cons.org.nz>
