Support libinput v120 API hi-res mouse scroll events

[tokyovigilante]

This is coming soonish, but after libinput 1.13 (kernel support has already landed). I've got the WIP code from Peter Hutterer and am working on implementing it in wlroots, so just adding an issue here so as not to duplicate effort.

https://gitlab.freedesktop.org/whot/libinput/tree/wip/hi-res-scrolling

https://gitlab.freedesktop.org/whot/xf86-input-libinput/commit/605148e3bd2931a18c1f88af1bf1027f78fdb011

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wlroots has migrated to gitlab.freedesktop.org. This issue has been moved to:

https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/1627