support jqfmt: jq formatter

[ccoVeille]

https://github.com/noperator/jqfmt

I'm unsure there is an official support of jq in linguist

But people are using it in Markdown

https://github.com/discoveryjs/jora/blob/refs%2Fheads%2Fmaster/docs%2Fcomplex-examples.md

[hougesen]

Seems cool.

As far as I can tell only stdin input is supported, which means #385 is needed first 😄

[hougesen]

This was closed by #755