linux: wayland: implement cursor style handling (#8632)

Release Notes:

- Implemented cursor style changing in wayland


[zed_cursor_wayland.webm](https://github.com/zed-industries/zed/assets/12579216/cbc03f85-41c1-4687-88b5-2aa5612d7129)

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Co-authored-by: Mikayla <mikayla@zed.dev>

crates/gpui/src/platform/linux/wayland.rs

@@ -4,5 +4,6 @@
 pub(crate) use client::*;
 
 mod client;
+mod cursor;
 mod display;
 mod window;