wayland: Window controls and drag (#11525)

Based on https://github.com/zed-industries/zed/pull/11046

- Partially fixes #10346 
- Fixes https://github.com/zed-industries/zed/issues/9964

## Features
Window buttons

![image](https://github.com/zed-industries/zed/assets/71973804/1b7e0504-3925-45ba-90b5-5adb55e0d739)

Window drag

![image](https://github.com/zed-industries/zed/assets/71973804/9c509a37-e5a5-484c-9f80-c722aeee4380)

Native window context menu

![image](https://github.com/zed-industries/zed/assets/71973804/048ecf52-e277-49bb-a106-91cad226fd8a)

### Limitations

- No resizing
- Wayland only (though X11 always has window decorations)

### Technical

This PR adds three APIs to gpui.

1. `show_window_menu`: Triggers the native title bar context menu.
2. `start_system_move`: Tells the compositor to start dragging the
window.
3. `should_render_window_controls`: Whether the compositor doesn't
support server side decorations.

These APIs have only been implemented for Wayland, but they should be
portable to other platforms.

Release Notes:

- N/A

---------

Co-authored-by: Akilan Elango <akilan1997@gmail.com>

crates/gpui/src/platform.rs

@@ -226,6 +226,10 @@ pub(crate) trait PlatformWindow: HasWindowHandle + HasDisplayHandle {
     #[cfg(target_os = "windows")]
     fn get_raw_handle(&self) -> windows::HWND;
 
+    fn show_window_menu(&self, position: Point<Pixels>);
+    fn start_system_move(&self);
+    fn should_render_window_controls(&self) -> bool;
+
     #[cfg(any(test, feature = "test-support"))]
     fn as_test(&mut self) -> Option<&mut TestWindow> {
         None