RPK autocomplete

[emaxerrno]

I think @c4milo actually brought up the point of using this auto-completer for RPK

https://github.com/c-bata/go-prompt

cc: @0x5d @rkruze

[emaxerrno]

@twmb - more food for thought here ^^

[twmb]

go-prompt drops into an interactive UI -- I've used it once for my own project, but it's more useful if you have a prompt that you stay in for a while, not something where you execute one command and leave the program.

I think more useful would be tab autocompletion. cobra comes with this out of the box, and I use it in kcl (though had a bit of a formatting fight), and I know kubernetes overrides how it has autocompletion by default.

[emaxerrno]

ah fair! tab autocompletion is better. good thinking.