add: support for nickel format
as Nickel
fixer
#4665
Merged
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Nickel(https://nickel-lang.org/) is a configuration language, like Jsonnet, Cue, Dhall.
nickel
(https://github.com/tweag/nickel) is the main command to run, export and also format Nickel code.this commit adds
nickel format
as a Nickel fixer, together with some tests and documentation.