DSC command completion

[ThomasNieto]

Summary of the new feature / enhancement

As a user I would like the dsc executable to generate completions so that shells can use that in their tab completion.

Proposed technical implementation details (optional)

WinGet supports this feature with a complete sub-command: https://learn.microsoft.com/en-us/windows/package-manager/winget/tab-completion

[michaeltlombardi]

It looks like the clap_complete crate could serve this purpose.

[SteveL-MSFT]

I've played with clap_complete before so it wouldn't be too difficult to add it keeping in mind it generates a shell script you'd run to register the completer.