Generate bash/zsh completions

[topheman]

• https://docs.rs/clap_complete/latest/clap_complete/
• https://github.com/clap-rs/clap/blob/master/clap_complete/examples/completion-derive.rs
• https://www.youtube.com/watch?v=BHxaUP0kz9w

[topheman]

Generated build for x86_64 with completions from https://github.com/topheman/snake-pipe-rust/actions/runs/8255147513

snakepipe-x86_64-apple-darwin.tar.gz