Rust remove unused dependencies

[atezet]

RustRover now detects unused dependencies in the Cargo.toml file and suggests a quick-fix option for easy removal.

• https://www.jetbrains.com/rust/whatsnew/

Apparently it works very well in RustRover, and it would be great if Zed would support this out of the box. Tools like cargo-machete and cargo-udeps come up with a lot of false positives/negatives and are harder to integrate in your work flow.