Create `cargo fix` equivilant tool

Bazel lacks many of the bells and whistles a native Rust/Cargo repository might. One of those things is the [cargo fix](https://doc.rust-lang.org/cargo/commands/cargo-fix.html) command. A tool for Bazel could probably be written to read rustc/clippy output and generate a patch to apply to source files in the repo using [rustfix](https://crates.io/crates/rustfix).