Display Rust implicit type annotations similar to VS Code

[bkbits]

As shown in the image, in VS Code, when type inference is successful, types that are not explicitly annotated are displayed with grayed-out type hints. It is hoped that this feature can be added to Zed.

[SomeoneToIgnore]

https://zed.dev/docs/configuring-zed?highlight=inlay%20hints#inlay-hints

https://zed.dev/docs/languages/rust?highlight=inlay#inlay-hints

[bkbits]

Thanks, this helps a lot.​