Better defaults for jsonnet fmt

[sbarzowski]

Right now jsonnet fmt by default does less than I would expect, e.g. it doesn't fix indentation.

Something like jsonnet fmt -n 2 --max-blank-lines 1 --sort-imports could be the default.

I think that ideally long-term we would have something like gofmt which provides heavily opinionated, "the only true" formatting, without any knobs. Having reasonable defaults is the first step in this direction.

[sparkprime]

My vote would be for:

-n 2 --max-blank-lines 2 --sort-imports --string-style s --comment-style s

This is what we now use internally, in the system you helped implement when you were here :)