Consider migration of some workflows to Apache Jena

[niegrzybkowski]

Now that Apache Jena is installed in the ci-worker, it might be a good idea to try it out some of the workflows, in particular when packaging. The riot utility allows quick reading and writing of rdf formats, which I believe is one of the bottlenecks in the pipeline currently.
I don't think Jena supports multiple output types, so it would need to first gather all the files together, before converting between formats. This could cause it to be slower, but without implementing it it's hard to tell.

Riot documentation link: https://jena.apache.org/documentation/io/#command-line-tools

[Ostrzyciel]

We could also have a custom Java application as the CI worker and invoke Jena's API directly. This can be really, really fast, I already use that in the CI worker of RiverBench: https://github.com/RiverBench/ci-worker

It's written in Scala and uses Pekko (ex-Akka) Streams to handle large datasets easily.