This commits deprecates `services.xserver.libinput` for multiple
settings, one for each kind of device:
- `services.xserver.libinput.mouse`
- `services.xserver.libinput.touchpad`
Looking at `man 4 libinput`, they basically have the same options so I
simply replicated them, even if some options doesn't make sense for
mouse (`tapping` for example).
With this commit this is now possible:
```nix
{
services.xserver.libinput = {
enable = true;
mouse = {
accelProfile = "flat";
};
touchpad = {
naturalScrolling = true;
};
};
}
```
And you will have a mouse with no natural scrolling but with accel
profile flat, while touchpad will have natural scrolling but accel
profile adaptative (default).
It is possible to support more device types
(tablets/keyboards/touchscreens), but at least looking at the
libinput manual for those devices it doesn't seem that it has any
configuration options for them. They can still be configured using
`services.xserver.inputClassSections` though, and this will work now
since there is no rule by default that matches them.
Closes issue #75007, while also making configuration of mouses and
touchpads using Nix attrs possible like said in PR #73785.
Instead of assign the libinput options to touchpad devices only, it
should be appied by any device using libinput.
Due to the fact that `40-libinput.conf` already defines libinput as
driver for any detected input device, we can use `MatchDriver` to appy
options.
