Implement more powerful shell completion #2029
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Warning
This PR is not ready by any means.
Note
I did some research here. Still WIP.
What type of PR is this?
What this PR does / why we need it:
see discussion in #1905
Which issue(s) this PR fixes:
resolves #1905
Special notes for your reviewer:
N/A
Testing
It would be cool if we could have some automated testing for shell completion.
Release Notes
TODO