Rust toolchain support in the project graph

Once now ships Rust toolchain support. It can generate graph rules for Cargo-backed dependencies, first-party Rust libraries and binaries, resolved crates, and proc macros. Cargo.toml and Cargo.lock are the source of truth, and Once workspace manifests can depend on a cacheable cargo_dependencies target. The previously generated third-party manifest and separate query deps resolver surface have been removed.