updates OWNERS files for third_party dependencies
usage: fx update-3p-owners [--num-threads N] [--rust-only | --integration-only] [--skip-rustc-3p-update] [--skip-existing] Updates OWNERS files for projects, based on gn target references. For any given project, the tool adds as owners the owners of the projects that depend on that project. By default, the tool updates OWNERS for: - third_party/rust_crates/vendor/*, for Rust crates specified in third_party/rust_crates/Cargo.toml - integration third party projects specified in integration/third_party/flower. Arguments: --num-threads N: run on N threads. --rust-only: update OWNERS files only for Rust crates, specified in third_party/rust_crates/Cargo.toml. --integration-only: update OWNERS files only for projects specified in integration/third_party/flower. --skip-existing: only generate OWNERS files for projects missing owners; does not update exiting OWNERS files. --skip-rustc-3p-update: skip updating rustc_library and rustc_binary third_party dependencies. See https://fuchsia.dev/fuchsia-src/development/languages/rust/third_party.md for more details.