Add setting for keeping typed query when exiting

[s0]

fixes #422

This introduces a new setting that can configure the behaviour when pressing Esc in interactive mode. Currently with only 2 options, to either return the empty string (and keeping the commandline unmodified), or returning the currently written query so far.

[s0]

On enum value naming, perhaps return-original instead of returnoriginal would be better etc...?

[ellie]

On enum value naming, perhaps return-original instead of returnoriginal would be better etc...?

I think this would definitely read better!

[ellie]

@s0 would be awesome to get a rebase here!

if my last comment is addressed I'm excited to merge this 🚀

[s0]

@ellie done! There was quite a lot of code change since I last looked at this so basically had to redo it hehe 😅

Not sure if I'm happy with the double if statement at the end there, but not sure if not explicitly checking RETURN_QUERY would then make it unclear?

[s0]

Looks like clippy didn't like the duplicate if statement blocks, removed them and just have a comment for now