Linux window decorations (#13611)

This PR adds support for full client side decorations on X11 and Wayland

TODO:
- [x] Adjust GPUI APIs to expose CSD related information
- [x] Implement remaining CSD features (Resizing, window border, window
shadow)
- [x] Integrate with existing background appearance and window
transparency
- [x] Figure out how to check if the window is tiled on X11
- [x] Implement in Zed
- [x] Repeatedly maximizing and unmaximizing can panic
- [x] Resizing is strangely slow
- [x] X11 resizing and movement doesn't work for this:
https://discord.com/channels/869392257814519848/1204679850208657418/1256816908519604305
- [x] The top corner can clip with current styling
- [x] Pressing titlebar buttons doesn't work
- [x] Not showing maximize / unmaximize buttons
- [x] Noisy transparency logs / surface transparency problem
https://github.com/zed-industries/zed/pull/13611#issuecomment-2201685030
- [x] Strange offsets when dragging the project panel
https://github.com/zed-industries/zed/pull/13611#pullrequestreview-2154606261
- [x] Shadow inset with `_GTK_FRAME_EXTENTS` doesn't respect tiling on
X11 (observe by snapping an X11 window in any direction)

Release Notes:

- N/A

---------

Co-authored-by: conrad <conrad@zed.dev>
Co-authored-by: Owen Law <81528246+someone13574@users.noreply.github.com>
Co-authored-by: apricotbucket28 <71973804+apricotbucket28@users.noreply.github.com>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/gpui/src/platform/test/window.rs

@@ -188,9 +188,7 @@ impl PlatformWindow for TestWindow {
 
     fn set_app_id(&mut self, _app_id: &str) {}
 
-    fn set_background_appearance(&mut self, _background: WindowBackgroundAppearance) {
-        unimplemented!()
-    }
+    fn set_background_appearance(&self, _background: WindowBackgroundAppearance) {}
 
     fn set_edited(&mut self, edited: bool) {
         self.0.lock().edited = edited;
@@ -262,13 +260,9 @@ impl PlatformWindow for TestWindow {
         unimplemented!()
     }
 
-    fn start_system_move(&self) {
+    fn start_window_move(&self) {
         unimplemented!()
     }
-
-    fn should_render_window_controls(&self) -> bool {
-        false
-    }
 }
 
 pub(crate) struct TestAtlasState {