Provide utility service which will convert Java Generated DTO to JSON

See comments below for some amount of guidance. As a first cut, we want to transcode information based on InstanceIdentifier + DataObject. The implementation needs to use mdsal-binding-dom-codec-api facilities to transcode the DataObject to a NormalizedNode and then turn that into a JSON string.

Once we have a prototype we can then evolve it to more effecient transcoding, including stream setup pipelines.