feat: Generate shell completions on build

[FilipRazek]

My attempt at closing #155

[sharkdp]

Thank you very much!

It would be great if we could also integrate the generated shell completion files in the artifacts we built when we make a release. You can find examples how we do this in some other projects of mine, like hyperfine (see this file and search for complete/completion) and search for complete/completion)

[FilipRazek]

Thanks for the hint, I tried to update the CICD file, tell me if this would work for you

[sharkdp]

You can find the generated artifacts here at the bottom: https://github.com/sharkdp/hexyl/actions/runs/8010537770

[FilipeBento]

Hello! Will this go through? 😄 (I don't have enough knowledge to implement this on my own, I'm sorry)

[sharkdp]

@FilipRazek Sorry for not coming back to this. Would it be possible to update this to the latest state of master? I'd love to integrate this.

[FilipRazek]

I'm sorry, I don't know how to integrate clap_complete with the new API. I will look into it but it doesn't seem to be a straightforward change