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/window.rs

@@ -1143,6 +1143,23 @@ impl<'a> WindowContext<'a> {
         self.window.platform_window.zoom();
     }
 
+    /// Opens the native title bar context menu, useful when implementing client side decorations (Wayland only)
+    pub fn show_window_menu(&self, position: Point<Pixels>) {
+        self.window.platform_window.show_window_menu(position)
+    }
+
+    /// Tells the compositor to take control of window movement (Wayland only)
+    ///
+    /// Events may not be received during a move operation.
+    pub fn start_system_move(&self) {
+        self.window.platform_window.start_system_move()
+    }
+
+    /// Returns whether the title bar window controls need to be rendered by the application (Wayland and X11)
+    pub fn should_render_window_controls(&self) -> bool {
+        self.window.platform_window.should_render_window_controls()
+    }
+
     /// Updates the window's title at the platform level.
     pub fn set_window_title(&mut self, title: &str) {
         self.window.platform_window.set_title(title);