Use RDF.rs as the core of rudof

[angelip2303]

We are working on RDF.rs, a Rust library for working with RDF-based knowledge graphs. Thus, we are planning to replace the core of the tool, namely SRDF, by the appropriate functions of the aforementioned framework. The idea of this document is to draft a roadmap of the core changes that have to be introduced in rudof to refactor it accordingly.

Roadmap

• Use the RDF format enum from RDF.rs #232

TBD

Goal

This will be concluded once the tool's core backend is no longer SRDF and it can be removed completely.