Autocomplete org alias CLI parameter

[JamieBriersBullhorn]

It would be a really nice QoL improvement, if the CLI could autocomplete org usernames/alias.

I had managed to achieve this in powershell, by editing %LOCALAPPDATA%\sf\autocomplete\functions\powershell\sf.ps1, however it got overridden on upgrade when I refreshed the autocomplete cache.

i.e. I would type in sf project deploy start -o adm and it would autocomplete to sf project deploy start -o adminUsername

[cristiand391]

Hey, yeah this is something I wanted to do too but we haven't decided on it yet.
See issue in plugin-autocomplete: oclif/plugin-autocomplete#620

sf uses the oclif framework (which we also maintain), shell completion is done in oclif's plugin-autocomplete so what we need is a salesforce-agnostic way to generate completions candidates at runtime.
If people is interested in this feature please upvote the post.

[cristiand391]

Also, if you are on zsh + fzf, I wrote an sf plugin to do this:
#2569