gorefs.json similar to gorefs.yaml

[sujaypatil96]

Modify the goref parser so that it can generate a gorefs.json equivalent to gorefs.yaml so that it can be validated by the JSON Schema in PR #1814.

[kltm]

@sujaypatil96 You don't necessarily need to worry about PRs into your own namespace.
I'm not quite following how this json is specifically working in our workflow here, but as long as were doing:
(gorefs.yaml, source of truth) -> (checking gorefs.yaml format and fields for correctness) -> (splitting into md) -> (injecting md into go website)
Each of those should probably be a separate runnable command.
If this is for the earlier (one time) step of:
(md) -> (gorefs.yaml)
Whatever works is great :)