Add functionality to auto-format or enforce formatting rules for config files

[kehoecj]

Requested by a user here

[21Average]

I’m interested in collaborating on this if you haven’t begun yet. I prefer add a -format flag, Here’s my proposed approach:

1. add a -format flag.
2. Create a new package called Formatter.
3. Modify the Run function in cli.go to format files after they’ve been validated (only formatting validated files).

Should we modify the existing files, or would it be better to create new ones?

[kehoecj]

@21Average It's yours to work on if you'd like. I think your approach makes sense. Please do an initial config type (XML, JSON, YAML, whichever) then put it up for an initial MR review

[kehoecj]

@21Average Haven't seen a PR in 3 weeks so I'm unassigning you so someone else can pick it up before hacktoberfest is over

[Kashugoyal]

@kehoecj is it cool if I take it over. This should be a quick one. I will start by adding the formatter just for json and later we can others in separate PRs.