Use the RDF format enum from RDF.rs

[artob]

This pull request adds the initial dependency on the RDF.rs framework and uses its functionality to replace srdf's home-grown RDFFormat enum, simplifying the Rudof code base.

The pull request also updates related, relevant dependencies to their latest releases.

Note that RDF.rs's MSRV is 1.81 while Rudof's is 1.78. I suggest bumping Rudof's, because 1.81 was a significant milestone release that introduced the core::error::Error trait that increasingly more and more dependencies (and transitive dependencies) will be relying upon.

[vemonet]

Hi @artob, interesting I had never heard about this new RDF rust library, in the past I have used sophia (https://github.com/pchampin/sophia_rs) when I don't need to do SPARQL queries on the graph, and oxigraph (https://github.com/oxigraph/oxigraph) when need for SPARQL queries

I was wondering how RDF.rs compares to Sophia or Oxigraph? Why not reusing existing libs put in place by Sophia or Oxigraph?
There has been a few tools already built on top of these two solutions

Note that currently issues are not enabled in the https://github.com/rust-rdf/rdf.rs repo (hence why I ask the question here :) )