GH-5604 New Query Renderer implementation

[hmottestad]

GitHub issue resolved: #5604

Briefly describe the changes proposed in this PR:

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PR Author Checklist (see the contributor guidelines for more details):

• my pull request is self-contained
• I've added tests for the changes I made
• I've applied code formatting (you can use mvn process-resources to format from the command line)
• I've squashed my commits where necessary
• every commit message starts with the issue number (GH-xxxx) followed by a meaningful description of the change

[hmottestad]

@kenwenzel here is the TupleExpr to SPARQL renderer that I was talking about.

[Copilot]

Pull request overview

This PR introduces a new query renderer implementation for RDF4J's SPARQL query rendering system. The implementation replaces the previous renderer with an intermediate representation (IR) based approach that provides better handling of property paths, nested structures, and SPARQL syntax transformations.

Key changes:

• New IR-based query rendering architecture with transform pipeline
• Property path fusion and normalization transforms
• Support for SPARQL collections, negated property sets, and complex path expressions

Reviewed changes

Copilot reviewed 144 out of 207 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ShrinkOnFailure.java	Test utility wrapper for minimizing failing queries via shrinking
SPARQLQueryRenderTest.java	Refactored test class removing static fields and lifecycle methods
PathTextUtilsTest.java	Unit tests for path text parsing and manipulation utilities
BracesEffectTest.java	Tests exploring how braces affect TupleExpr and IR representation
AlgebraExplorationTest.java	Ad-hoc tests for inspecting TupleExpr algebra structures
VarUtils.java	Utility class for RDF4J Var comparison and path variable recognition
TextEscapes.java	Utility for escaping SPARQL string literals
TermRenderer.java	Rendering helpers for IRIs and RDF4J Values
SparqlNameUtils.java	SPARQL name validation helpers (prefixed names, PN_LOCAL checks)
ExprTextUtils.java	Helpers for adding/removing parentheses around expression text
Transform classes	Multiple transform classes implementing IR rewriting and optimization
package-info.java files	Package documentation marking IR packages as experimental

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