linux: scrolling improvements (#9103)

This PR adjusts scrolling to be a lot faster on Linux and also makes
terminal scrolling work.

For Wayland, it makes scrolling faster by handling the `AxisValue120`
event (which also allows high-resolution scrolling on supported mice)
On X11, changed the 1 line per scroll to 3.

### Different solutions

I tried replicating Chromium's scrolling behaviour, but it was
inconsistent in X11/Wayland and found it too fast on Wayland. Plus, it
also didn't match VSCode, since it seems that they do something
different.

Release Notes:

- Made scrolling faster on Linux
- Made terminal scroll on Linux

crates/terminal/src/terminal.rs

@@ -70,7 +70,10 @@ actions!(
 ///Scrolling is unbearably sluggish by default. Alacritty supports a configurable
 ///Scroll multiplier that is set to 3 by default. This will be removed when I
 ///Implement scroll bars.
+#[cfg(target_os = "macos")]
 const SCROLL_MULTIPLIER: f32 = 4.;
+#[cfg(not(target_os = "macos"))]
+const SCROLL_MULTIPLIER: f32 = 1.;
 const MAX_SEARCH_LINES: usize = 100;
 const DEBUG_TERMINAL_WIDTH: Pixels = px(500.);
 const DEBUG_TERMINAL_HEIGHT: Pixels = px(30.);