two-step SPARQL examples

[egonw]

@MaxMuller98, @elenadelpup, @DeniseSl22,

I want to propose a two-step approach for the SPARQL examples. We are currently not using this for any of our SPARQL endpoints, but I have been moving in that direction. The steps:

1. have the queries use "SPARQL examples": https://chem-bla-ics.linkedchemistry.info/2024/11/17/sparql-examples.html
2. make such a repository compatible for "SPARQLQueries" used by SNORQL

cc @marvinm2