[ruff+ty] Add colour to --help

[hugovk]

Summary

The output of uv --help uses green and cyan to improve readability. But ruff and ty do not:

Let's add similar styling to ruff and ty. This is the main bit in uv:

https://github.com/astral-sh/uv/blob/85c5d32284522eb958d9cfc10ff62f0956eab113/crates/uv-cli/src/lib.rs#L88-L93

Test Plan

Compare and check they have similarly styled output:

./target/debug/ruff --help
./target/debug/ty --help
uv --help

Also run with NO_COLOR=1 to confirm there's no colour or bold text:

NO_COLOR=1 ./target/debug/ruff --help
NO_COLOR=1 ./target/debug/ty --help
NO_COLOR=1 uv --help

[MichaReiser]

Thank you, this is great