Add yield keyword highlight for Rust (#10104)

Release Notes:

- Added `yield` keyword highlight for Rust


Ref:

- https://github.com/rust-lang/rust-analyzer/pull/7209
-
https://github.com/rust-lang/rust-analyzer/blob/master/crates/ide/src/syntax_highlighting/highlight.rs#L177
-
https://doc.rust-lang.org/reference/keywords.html?highlight=yield#reserved-keywords


In VS Code:
 

![SCR-20240403-hrb](https://github.com/zed-industries/zed/assets/5518/ec3e84ce-ea9d-4b2d-832d-ecdfec0def91)

docs.rs:
https://docs.rs/async-stream/latest/async_stream/macro.try_stream.html


![SCR-20240403-gpk](https://github.com/zed-industries/zed/assets/5518/07010c2c-341d-4ae2-ba80-5f4eab4dbf60)

## Before

<img width="644" alt="image"
src="https://github.com/zed-industries/zed/assets/5518/da349187-57e6-4cea-b3e3-f628ce6a99e8">


## After update in Zed

![SCR-20240403-hqk](https://github.com/zed-industries/zed/assets/5518/44f1687b-ec38-42c2-984d-15177bed7e5b)

crates/languages/src/rust/highlights.scm

@@ -93,6 +93,7 @@
   "use"
   "where"
   "while"
+  "yield"
   (crate)
   (mutable_specifier)
   (super)