Provider a metacommand to disable auto complete

[kaidaguerre]

from #1689:

Is there a way to disable autocomplete in the interactive query mode? 

For some reason with Ubuntu Linux 20.04.4 LTS for WSL, autocomplete is very aggressive. 

The windows doesn't pop-up below the current line/prompt, and otherwise does strange things to the focus. It's basically intolerable.

 Now, it doesn't do this in my Mac terminal, but I need to use my work PC for my work-account-related stuff.

Also, autocomplete can be sluggish with very high numbers of connections