feat(sparql): support construct collections, fresh blank nodes, IRI escapes and numeric normalization (#609, #600)

[abdessamad-abdoun]

Summary

Combines the work of @abdessamad-abdoun on numeric normalization and date comparisons with review refinements covering:

• CONSTRUCT collections & property lists: recursive expansion of (...) and [...] in object position and templates.
• Blank node freshness & anti-collision: solution-scoped fresh blank node generation without label collisions.
• Unicode escapes: strict scalar validation and decoding in IRIs and prologue (SparqlIriEscapes).
• Literal escapes: preservation of escaped backslashes before surrogate-like sequences.

Conformance Impact

W3C test suite failures reduced from 10 to only 2:

• Basic - List 1 ✅
• dawg-construct-reification-1 ✅
• dawg-construct-reification-2 ✅
• CONSTRUCT list ✅
• date-2 ✅
• syntax-esc-04.rq & syntax-esc-05.rq ✅
• Calculate which sets are subsets of others ✅
• unicode codepoint escaping partial surrogate pair ✅

Resolves #609
Resolves #600

[github-actions]

Overall Project	55.63% -0.02%	🍏
Files changed	81.13%	🍏

File	Coverage
WhereCompiler.java	97.41%	🍏
ConstructQueryCompiler.java	96.53%	🍏
NextFilterFromAst.java	93.22%	🍏
NativeValueComparison.java	91.17%	🍏
NextSparqlPipelineExecutor.java	89.87%	🍏
SparqlTermBuilder.java	87.87% -0.19%	🍏
ConstructQueryAstListener.java	84.31% -15.36%	🍏
SparqlTermResolver.java	76.97% -4.89%	❌
AstBackedExpr.java	72.18% -0.12%	🍏

[github-actions]

Test Results

  448 files    448 suites   34s ⏱️
3 157 tests 3 157 ✅ 0 💤 0 ❌
3 176 runs  3 176 ✅ 0 💤 0 ❌

Results for commit d2493c5.

[remiceres]

LGTM! Outstanding work, resolves #609 and #600 with 99.97% executed pass rate on W3C conformance suite.

[github-actions]

Overall Project	55.66% -0.01%	🍏
Files changed	93.53%	🍏

File	Coverage
PrologueAstListener.java	100%	🍏
WhereCompiler.java	97.41%	🍏
ConstructQueryCompiler.java	96.53%	🍏
SparqlIriEscapes.java	93.7% -6.3%	🍏
SparqlTermResolver.java	93.41% -0.39%	🍏
NextFilterFromAst.java	93.22%	🍏
NativeValueComparison.java	91.17%	🍏
NextSparqlPipelineExecutor.java	90.6%	🍏
ConstructQueryAstListener.java	90.4% -9.29%	🍏
SparqlTermBuilder.java	83.36% -0.18%	🍏
AstBackedExpr.java	72.18% -0.12%	🍏