Implement a JSON5 with Comments representation in JSON

I have a design document that describes how one might generate a pure JSON document that includes a loss-less representation of the JSON5 data _and_ it's comments, including all metadata currently implemented in the `json5format` API to reconstitute the comments with intended relationships and formatting constraints.

This could be used to feed a JSON5 document to a JSON tool, manipulate the content, and reconstitute the JSON5 without losing any context, associations, or dependencies.

Ideally, JSON5-specific extensions for primitive value formats would be handled by converting the JSON5 string representation of the value to a JSON-native representation, and adding metadata to save the original format.