nushell nuon output

[MilesCranmer]

x-ref nushell/nushell#14253

It would be nice to have proper output for nushell. I think we could just have a feature so that the user could choose to compile rip2 such that it outputs directly in nushell format.

cargo install --features nu --locked rip2

Alternatively the current workaround is to just chain it like:

rip -s | from tsv

which will render things in the proper nushell format.