Support quads via Graph Store Protocol #2228
Description
I got asked if Trig is supported in QLever and I was curious about the use case. The software in question uses the Graph Store Protocol to post Trig files to SPARQL endpoints. While this behavior is not formally part of the spec, it seems to be supported by several implementations.
I came across a helpful comment by @afs in this SPARQL-dev issue, explaining how Fuseki handles it.
Based on that, I propose we add support for this in QLever as well. As Andy points out, it makes sense and should be straightforward to implement.
I know Trig is at the moment not supported but it could be implemented/supported with/for N-Quads.