feat: Add "print completion" command.

Description

Some CLIs choose not to auto-install the completion files but rather to expose a command where a completion script is printed in the stdout.

Then a CLI user's usage would be like this:

my_cli completion-script >> ~/.zshrc

Requirements

Additional Context

The same approach used by NPM and GH CLI, among others

As described by this comment: #47 (comment)

This would be awesome to have!

Great, I will work on a PR and push it soon.

I've opened a pull request: #128

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