Add brace / bracket / paren matching to the REPL

[johnslavik]

Feature or enhancement

Proposal:

If I touch a paren or a brace or a bracket with the cursor, highlight the other matching paren / brace / bracket.

We can also consider coloring them differently, but lazily highlighting matching parens would probably be much more useful and less tiring for the eyes.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

[edvilme]

Hi, if you're not planning to already, I would love to work on this :)

[johnslavik]

Thanks @edvilme, I'd like to make the PR this time. Feel invited to review it though.