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/lib.rs

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