Is your feature request related to a problem? Please describe.

It would be particularly interesting to have a vim command-like mode on this thing to make it so users can run specific commands without necessarily having a keybinding tied to it

Describe the solution you'd like

Having it so if : is pressed, open the Command mode, it would probably work just like vim! You would be able to just use other features, like, for example, if a single-tab mode would be implemented you could have a single-tab-toggle command, or if binary diffing were to be implemented, you would be able type diff foo.elf bar.elf or whatever else. This probably could be implemented with nushell's reedline crate.