Integrate profiling into gpui (#8176)

[Profiling](https://crates.io/crates/profiling) crate allows easy
integration with various profiler tools. The best thing is - annotations
compile to nothing unless you request a specific feature.

For example, I used this command to enable Tracy support:
```bash
cargo run --features profiling/profile-with-tracy
```
At the same time I had Tracy tool open and waiting for connection. It
gathered nice stats from the run:

![zed-profiler](https://github.com/zed-industries/zed/assets/107301/5233045d-078c-4ad8-8b00-7ae55cf94ebb)


Release Notes:
- N/A

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

@@ -444,6 +444,7 @@ impl BladeRenderer {
         self.gpu.metal_layer().unwrap().as_ptr()
     }
 
+    #[profiling::function]
     fn rasterize_paths(&mut self, paths: &[Path<ScaledPixels>]) {
         self.path_tiles.clear();
         let mut vertices_by_texture_id = HashMap::default();
@@ -506,7 +507,10 @@ impl BladeRenderer {
     }
 
     pub fn draw(&mut self, scene: &Scene) {
-        let frame = self.gpu.acquire_frame();
+        let frame = {
+            profiling::scope!("acquire frame");
+            self.gpu.acquire_frame()
+        };
         self.command_encoder.start();
         self.command_encoder.init_texture(frame.texture());
 
@@ -529,6 +533,7 @@ impl BladeRenderer {
             }],
             depth_stencil: None,
         }) {
+            profiling::scope!("render pass");
             for batch in scene.batches() {
                 match batch {
                     PrimitiveBatch::Quads(quads) => {
@@ -718,6 +723,7 @@ impl BladeRenderer {
         self.command_encoder.present(frame);
         let sync_point = self.gpu.submit(&mut self.command_encoder);
 
+        profiling::scope!("finish");
         self.instance_belt.flush(&sync_point);
         self.atlas.after_frame(&sync_point);
         self.atlas.clear_textures(AtlasTextureKind::Path);