Support HumanReadableJsonProtocol

[fire]

https://blog.parsable.com/using-human-readable-json-endpoints-with-thrift-for-free-774ba505c893

Any interest in implementing this?

[jparise]

It's not thing we use, so it's unlikely we'll implement it. Next on the list is ThriftMux support, perhaps followed by Thrift Compact Binary.