Set appid/wmclass for zed window (#10909)

fixes https://github.com/zed-industries/zed/issues/9132

By setting the app id, window managers like `sway` can apply custom
configuration like `for_window [app_id="zed"] floating enable`.
Tested using `wlprop`/`hyprctl activewindow` for wayland, `xprop` for
x11.


Release Notes:

- Zed now sets the window app id / class, which can be used e.g. in
window managers like `sway`/`i3` to define custom rules

crates/gpui/src/platform.rs

@@ -209,6 +209,7 @@ pub(crate) trait PlatformWindow: HasWindowHandle + HasDisplayHandle {
     fn activate(&self);
     fn is_active(&self) -> bool;
     fn set_title(&mut self, title: &str);
+    fn set_app_id(&mut self, app_id: &str);
     fn set_background_appearance(&mut self, background_appearance: WindowBackgroundAppearance);
     fn set_edited(&mut self, edited: bool);
     fn show_character_palette(&self);
@@ -557,6 +558,9 @@ pub struct WindowOptions {
 
     /// The appearance of the window background.
     pub window_background: WindowBackgroundAppearance,
+
+    /// Application identifier of the window. Can by used by desktop environments to group applications together.
+    pub app_id: Option<String>,
 }
 
 /// The variables that can be configured when creating a new window
@@ -599,6 +603,7 @@ impl Default for WindowOptions {
             display_id: None,
             fullscreen: false,
             window_background: WindowBackgroundAppearance::default(),
+            app_id: None,
         }
     }
 }