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/zed/src/main.rs

@@ -266,6 +266,7 @@ fn init_ui(
     welcome::init(cx);
     settings_ui::init(cx);
     extensions_ui::init(cx);
+    performance::init(cx);
 
     cx.observe_global::<SettingsStore>({
         let languages = app_state.languages.clone();
@@ -315,6 +316,7 @@ fn init_ui(
 }
 
 fn main() {
+    let start_time = std::time::Instant::now();
     menu::init();
     zed_actions::init();
 
@@ -326,7 +328,9 @@ fn main() {
     init_logger();
 
     log::info!("========== starting zed ==========");
-    let app = App::new().with_assets(Assets);
+    let app = App::new()
+        .with_assets(Assets)
+        .measure_time_to_first_window_draw(start_time);
 
     let (installation_id, existing_installation_id_found) = app
         .background_executor()