[Drivers] Implement third-party store adapters for comparative evaluation (Apache Jena, RDF4J)

[remiceres]

Summary

Implement third-party store adapters for prominent open-source RDF engines (Apache Jena, Eclipse RDF4J) within the generic benchmark harness for external performance positioning.

Objectives and Technical Scope

1. Adapter Implementations

• Implement TripleStoreDriver for Apache Jena (ARQ in-memory / TDB2).
• Implement TripleStoreDriver for Eclipse RDF4J (MemoryStore / NativeStore).

2. Comparative Execution

• Run standardized workloads under identical JVM parameters and hardware configurations.
• Generate cross-engine comparative datasets.

Acceptance Criteria

[ ] Apache Jena and Eclipse RDF4J drivers execute successfully on benchmark datasets.
[ ] Unified result reports include comparative metrics across Corese 4, Corese 5, Jena, and RDF4J.