[FEATURE] Support semantic graph databases (RDF, SPARQL DB)

[odysa]

What is the use case?
Export generated knowledge graph to semantic graph databases like GraphDB, RDF4J, Oxigraph. It extend the functionality to RDF and SPARQL world.

[nice-to-have] Also, we may export the generated knowledge graph to RDF formats like turtle, N-Quad, Json-ld.

Describe the solution you'd like

Implement db clients.

Additional context

---

❤️ Contributors, please refer to 📙Contributing Guide.
Unless the PR can be sent immediately (e.g. just a few lines of code), we recommend you to leave a comment on the issue like I'm working on it or Can I work on this issue? to avoid duplicating work. Our Discord server is always open and friendly.

[badmonster0]

@odysa Thanks a lot for the feature request! We've created #416 for native support and is looking at it.
For Graph data base, do you have preference between GraphDB, RDF4J, Oxigraph?

thanks!