johsol/iterator benchmark range

[johansolbakken]

• Make numeric attribute
• Add AttributeRangeFactoryBuilder
• Add range_attr test case and add fetch postings timer

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[Copilot]

Pull request overview

This PR extends the iterator benchmark test harness with a new attribute range-search benchmark case, adds support for building numeric attributes for benchmarks, and records fetch-postings timing as part of benchmark results.

Changes:

• Added AttributeRangeBlueprintFactory (+ RangeConfig) to generate blueprints for attribute range queries.
• Added AttributeContextBuilder::add_numeric() to populate integer attributes from a generator.
• Extended benchmark reporting/pond recording with fetch_postings_time_ms and added a new analyze_attr_range test case.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
searchlib/src/tests/queryeval/iterator_benchmark/leaf_blueprint_factory.h	Adds RangeConfig and AttributeRangeBlueprintFactory declarations.
searchlib/src/tests/queryeval/iterator_benchmark/leaf_blueprint_factory.cpp	Implements range attribute population and creates a SimpleRangeTerm blueprint.
searchlib/src/tests/queryeval/iterator_benchmark/iterator_benchmark_test.cpp	Adds fetch-postings timing, range config fields, and a new ATTR_RANGE benchmark test.
searchlib/src/tests/queryeval/iterator_benchmark/blueprint_factory_builder.h	Declares attr_range() factory builder entry point.
searchlib/src/tests/queryeval/iterator_benchmark/blueprint_factory_builder.cpp	Implements attr_range() by constructing AttributeRangeBlueprintFactory.
searchlib/src/tests/queryeval/iterator_benchmark/attribute_ctx_builder.h	Declares AttributeContextBuilder::add_numeric().
searchlib/src/tests/queryeval/iterator_benchmark/attribute_ctx_builder.cpp	Implements add_numeric() to create and populate an integer attribute.

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