Support for JSON comments

[brettz9]

Summary

Support a JSON with comments mode so that users can opt not to get errors when comments are used within JSON files (or ideally, within specific JSON file names, like .eslintrc and .eslintrc.json).

Motivation

It is annoying to see linting errors when viewing such a file, and it deters one from adding helpful comments to ESLint RC files (ESLint config files support this format: https://eslint.org/docs/user-guide/configuring/configuration-files#comments-in-configuration-files ).

Describe alternatives you've considered

The existing language-json-comments package does not work for me.

While I understand JSON proper does not support comments, I think it makes sense for this existing package to implement since it appears that often the "json" extension is still used and Visual Studio treats this similarly as another mode

Additional context

There is a spec for this and several parsers:

• jsonc-parser by Microsoft
• comment-json
• json-comments
• json-comment-parser
• one-json

[cornelius-dol]

Yes, please! We use "human" JSON files for configuration extensively, and our parser supported standard curly-brace language comments, /* ... */ and //. It would be awesome to have these rendered in the configured comment color.