[Proposal] Sort autocomplete suggestions vertically in IEx

[Julien]

Hello! This is fairly minor - and I could be the only one bothered by this - but I find it fairly hard to parse the list of autocomplete suggestions because they're sorted horizontally among three columns (screenshot below).

I think that it would be more helpful if they could be sorted vertically (example screenshot with Python below)

## IEx

## Python

[José Valim]

I think this is a good idea. The shell auto completion is provided by Erlang, so someone would need to provide a PR there!

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[Julien]

(deleted my previous message where I was excited to work on this but did not realize this would be in the Erlang codebase ;) )

Thank you José for the quick reply! I can take a look there but I would definitely welcome someone's help for such a PR.