Add a setting to show time to first window draw and frames per second in status bar (#16422)

I want to showcase Zed's performance via videos, and this seemed like a
good way to demonstrate it.


https://github.com/user-attachments/assets/f4a5fabc-efe7-4b48-9ba5-719882fdc856

Release Notes:

- On macOS, you can now set assign `performance.show_in_status_bar:
true` in your settings to show the time to the first window draw on
startup and then current FPS of the containing window's renderer.

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>
Co-authored-by: David Soria Parra <167242713+dsp-ant@users.noreply.github.com>
Co-authored-by: Danny Hua <danny.hua@hey.com>

crates/gpui/src/platform/blade/blade_renderer.rs

@@ -9,6 +9,7 @@ use crate::{
 };
 use bytemuck::{Pod, Zeroable};
 use collections::HashMap;
+use futures::channel::oneshot;
 #[cfg(target_os = "macos")]
 use media::core_video::CVMetalTextureCache;
 #[cfg(target_os = "macos")]
@@ -537,7 +538,12 @@ impl BladeRenderer {
         self.gpu.destroy_command_encoder(&mut self.command_encoder);
     }
 
-    pub fn draw(&mut self, scene: &Scene) {
+    pub fn draw(
+        &mut self,
+        scene: &Scene,
+        // Required to compile on macOS, but not currently supported.
+        _on_complete: Option<oneshot::Sender<()>>,
+    ) {
         self.command_encoder.start();
         self.atlas.before_frame(&mut self.command_encoder);
         self.rasterize_paths(scene.paths());
@@ -766,4 +772,9 @@ impl BladeRenderer {
         self.wait_for_gpu();
         self.last_sync_point = Some(sync_point);
     }
+
+    /// Required to compile on macOS, but not currently supported.
+    pub fn fps(&self) -> f32 {
+        0.0
+    }
 }