refactor(query): decouple kgram execution engine from next query ast (#568)

[remiceres]

Summary

Decouple fr.inria.corese.core.next.query and its internal KGRAM execution engine from legacy Corese v4 packages (fr.inria.corese.core.kgram.* and fr.inria.corese.core.sparql.*), eliminate temporary bridge adapters, and resolve all SonarLint code smells and cognitive complexity issues across the module.

Resolves #568

Architecture and Implementation Highlights

1. Complete Decoupling from Legacy IDatatype and Packages

• Replaced fr.inria.corese.core.sparql.api.IDatatype with fr.inria.corese.core.next.data.api.model.DatatypeValue across the internal KGRAM execution engine (next.query.impl.kgram).
• Introduced DatatypeValue and RdfValueOrder public contracts in core.next.data.
• Standardized total ordering rules conforming to SPARQL total order specifications.
• Validated by NextModuleBoundaryTest with 0 legacy imports in next.query.

2. Elimination of Compatibility Bridges and Native AST Evaluation

• Removed obsolete bridge classes: BindingAdapter, DatatypeAdapter, KgramNodeConverter, NextDatatypeValueAdapter, SparqlAstToExpression, SparqlBuiltinFunctionNameResolver, StorageManagerKgramValues.
• Introduced specialized native expression evaluators in next.query.impl.sparql.bridge:

• NativeNumericExpressionEvaluator: arithmetic and numeric comparisons
• NativeStringExpressionEvaluator: string operations and regex matching
• NativeBooleanExpressionEvaluator: boolean logic and effective boolean value evaluation
• NativeTemporalExpressionEvaluator: date/time extraction and calculations
• NativeIriExpressionEvaluator: IRI validations and conversions
• SparqlTermResolver: resolution and conversion between AST terms and Next data model
  • Simplified WhereCompiler, AstBackedExpr, and CoreseAstQueryBuilder.

3. Code Quality and SonarLint Remediation

• Resolved all 309 SonarLint code smells and bugs across all 86 files in corese-core.
• Reduced cognitive complexity under the threshold (< 15) in critical engine methods (PathFinder, Mappings, Eval, Query, Exp, BasicPatternGenerator, HeuristicsBasedEstimation).
• Documented all internal KGRAM subpackages with package-info.java.

Quality and Conformance Verification

• Internal unit tests (corese-core): 100% passing (./gradlew test).
• W3C Conformance suite (corese-w3c): 2,859 test cases evaluated against feature/corese-next baseline with exactly 0 regressions.
• Architectural boundary rules (NextModuleBoundaryTest): 100% compliant.

[github-actions]

Overall Project	52.83% -1.66%	🍏
Files changed	34.98%	❌

File	Coverage
Value.java	100%	🍏
Evaluator.java	100%	🍏
WhereCompiler.java	100%	🍏
CoreseAstQueryBuilder.java	90.93% -2.59%	🍏
NextSparqlPipelineExecutor.java	88.83% -6.78%	🍏
CoreseRepository.java	84.68% -14.52%	❌
Checker.java	82.84% -7.1%	🍏
QueryPrologueAst.java	77.78%	🍏
CoreseUpdate.java	77.23% -4.7%	🍏
RdfValueOrder.java	74.85% -25.15%	🍏
KgramNodes.java	74.16% -1.12%	🍏
StorageManagerEdge.java	73.47%	🍏
NodeImpl.java	72.16% -21.99%	🍏
NextFilterFromAst.java	71.43% -22.22%	🍏
SparqlKgramEvaluator.java	68%	🍏
NativeEvaluationContext.java	64.81% -35.19%	🍏
Query.java	62.72% -5.75%	❌
SparqlTermResolver.java	61.99% -38.01%	🍏
StorageManagerProducer.java	59.71% -1.98%	🍏
CoreseBindingSet.java	49.3% -38.03%	❌
DatatypeValue.java	48.62% -51.38%	❌
AstBackedExpr.java	46.83% -52.57%	❌
Mappings.java	40.32% -14.24%	❌
Exp.java	39.25% -12.68%	❌
Memory.java	39.06% -12.6%	❌
ProcessVisitor.java	38.46%	🍏
FilterPattern.java	38.04%	🍏
Extern.java	37.9% -20.16%	❌
NativeExpressionEvaluator.java	37.5% -62.5%	❌
NativeBooleanExpressionEvaluator.java	36.38% -63.62%	❌
NativeNumericExpressionEvaluator.java	34.02% -65.98%	❌
Producer.java	33.33%	🍏
Eval.java	32.53% -10.66%	❌
NativeValueComparison.java	27.85% -72.15%	❌
Compile.java	27.34% -10.98%	❌
NativeStringExpressionEvaluator.java	25.63% -74.37%	❌
Mapping.java	25.57% -0.72%	❌
JavaDScall.java	22.99% -13.79%	❌
ProducerDefault.java	6.45%	🍏
Edge.java	6.12%	🍏
NativeTemporalExpressionEvaluator.java	5.92% -94.08%	❌
ProcessVisitorDefault.java	5.62% -6.74%	❌
ApproximateSearchEnv.java	5.1% -35.67%	❌
CompleteSPARQL.java	4.58% -26.41%	❌
EvalGraph.java	4.11% -48.42%	❌
EvalJoin.java	2.93% -24.15%	❌
EvalSPARQL.java	2.65% -19.55%	❌
EnvironmentImpl.java	2.38% -1.59%	❌
PathFinder.java	0% -38.1%	❌
PointerType.java	0% -3.23%	❌
Node.java	0% -30.77%	❌
Filter.java	0%	🍏
BindingContext.java	0%	🍏
Expr.java	0% -71.43%	❌
EventImpl.java	0% -41.03%	❌
Environment.java	0%	🍏
NativeIriExpressionEvaluator.java	0%	❌
BasicPatternGenerator.java	0% -43.88%	❌
HeuristicsBasedEstimation.java	0% -46.11%	❌
IterableEntity.java	0% -98.41%	❌
Checker.java	0% -24.11%	❌