Support a better mutation format, potentially JSON-LD

[manishrjain]

For mutations. Also ensure that it can work with facets.

[manishrjain]

Ref: #1

[ashwin95r]

This library seems to fit our need (https://github.com/kazarena/json-gold). We can convert the JSON-LD to RDF Nquads and then follow the same code path.

[harlantwood]

Very happy to see this on your roadmap! 👍