Replace easy-parallel with scoped-pool for path searches

The easy-parallel crate spawned new threads on each call, which was resulting in way too many threads.

Co-Authored-By: Brooks Swinnerton <934497+bswinnerton@users.noreply.github.com>

gpui/src/app.rs

@@ -414,6 +414,7 @@ impl MutableAppContext {
                 windows: HashMap::new(),
                 ref_counts: Arc::new(Mutex::new(RefCounts::default())),
                 background: Arc::new(executor::Background::new()),
+                scoped_pool: scoped_pool::Pool::new(num_cpus::get()),
             },
             actions: HashMap::new(),
             global_actions: HashMap::new(),
@@ -1336,6 +1337,7 @@ pub struct AppContext {
     windows: HashMap<usize, Window>,
     background: Arc<executor::Background>,
     ref_counts: Arc<Mutex<RefCounts>>,
+    scoped_pool: scoped_pool::Pool,
 }
 
 impl AppContext {
@@ -1374,6 +1376,10 @@ impl AppContext {
     pub fn background_executor(&self) -> &Arc<executor::Background> {
         &self.background
     }
+
+    pub fn scoped_pool(&self) -> &scoped_pool::Pool {
+        &self.scoped_pool
+    }
 }
 
 impl ReadModel for AppContext {

gpui/src/lib.rs

@@ -29,3 +29,4 @@ pub use presenter::{
     AfterLayoutContext, Axis, DebugContext, EventContext, LayoutContext, PaintContext,
     SizeConstraint, Vector2FExt,
 };
+pub use scoped_pool;