Add a qmk format-json command that will format JSON files (#12372)

* Add a command to format json files

* change to work after rebase

* add test for qmk format-json

* add documentation for qmk format-json

* Update lib/python/qmk/cli/format/json.py

lib/python/qmk/cli/__init__.py

@@ -16,6 +16,7 @@ from . import docs
 from . import doctor
 from . import fileformat
 from . import flash
+from . import format
 from . import generate
 from . import hello
 from . import info