KDL config support

[rektide]

Please describe your feature request..

I wish I could use yq to configure my Wayland server, Niri. Niri uses KDL. kDL is a "cuddly document language", which is yet another json/yaml/et cetera like language.

Describe the solution you'd like

Ideally I use yq in very much the same way I use it for json or yaml.

Describe alternatives you've considered

sed, and other crimes

Additional context