Should `clap_complete` be part of the multicall binary?

[tertsdiepraam]

Prompted by a comment on Reddit by epage, I think we should try to not depend on clap_complete at runtime or at least make it optional. The simplest thing to do is to hide it behind a feature flag. But we could also generate completions at compile time or create a separate binary that can generate the completions.

If you know how other projects do this or have an idea on how to improve this, feel free to comment below!

[tertsdiepraam]

bat and ripgrep seem to just generate the completions at compile time and put them somewhere in the target directory. Seems like a good solution.