Is your feature request related to a problem? Please describe.

I added a plugin, by having an executable in my PATH named chezmoi-foo, and I can run it with chezmoi foo but foo does not show as one of the completion options for chezmoi in bash.

Describe the solution you'd like

I'd like chezmoi to include plugin names (only names, no expectation for their parameters) in its completion candidates.

Describe alternatives you've considered

The only consideration has been creating some form of completion wrapper, but it seems overkill.

Additional context

Docs say:

chezmoi supports plugins, similar to git.

That statement partially strengthened my expectation because git provides this completion for plugins.