Feature/473 autonomous next query pipeline

[remiceres]

Summary

This PR adds the first autonomous end-to-end SPARQL execution path for the next query pipeline.

It proves that simple queries can now run through:

SPARQL string -> next parser -> next AST -> next KGRAM -> StorageManagerProducer -> StorageManager

without using the legacy QueryProcess.

This PR is stacked on top of #472.

Changes

• Configure ANTLR generated sources correctly for Gradle and IDEs.
• Add UnsupportedQueryFeatureException for clear unsupported-feature errors.
• Add next AST support for simple INSERT DATA and DELETE DATA.
• Add CONSTRUCT support in CoreseAstQueryBuilder.
• Add NextSparqlPipelineExecutor as an internal integration executor.
• Add end-to-end tests for SELECT, ASK, CONSTRUCT, DESCRIBE, INSERT DATA, and DELETE DATA.

Scope

This is not the final public SPARQL API.

Unsupported SPARQL features fail explicitly.