Source tree fx subcommands

Command	Description
cipd	run the cipd command line tool
create	Scaffold new projects
jiri	multi-purpose tool for multi-repo development.
rfc	Scaffold new RFCs
sync-to	Sync the local Fuchsia source tree to a given state
check-goldens	Checks all golden file comparisons in the GN build graph.
clang-tidy	runs clang-tidy on specified files
format-code	runs source formatters on modified files
gen-cargo	generate symlinks to Rust Cargo.toml output files
grep	print lines in the Fuchsia sources matching the given pattern
lint	runs source linters on modified files
pending-commits	view commits not yet published to global integration
rustfmt	format Rust code
set-petal	configure jiri to manage a specific petal
shush	silence rust lints with allows or compiler suggested fixes
sync-from-stem	sync integration and deps to a state matching fuchsia.git state
update-3p-owners	updates OWNERS files for third_party dependencies
update-rust-3p-outdated	updates external Rust dependencies with latest from crates.io
update-rustc-third-party	updates rustc_library and rustc_binary third_party dependencies