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fb45eb132e
Split out cargo-util package for cargo-test-support. This splits out code from `cargo` that was being used by `cargo-test-support` in order to remove the dev-dependency cycle on the `cargo` crate. The intent here is to improve development build times. On my system, `touch src/cargo/lib.rs ; cargo check --profile=test` goes from 6.4 seconds to 3.5. I suspect more substantial changes (more than just `touch`) should exhibit even more improvements. This has a substantial downside that it is another package to manage publishing, particularly with making sure the version is updated correctly for crates.io. I'm uncertain if on balance it is worth it, but I lean towards moving forward with it.