Vector Search Scenario

[yabsp]

Add VectorBench scenario for benchmarking vector search

Summary

• Adds a new VectorBench scenario (and Postgres-specific variant PgVectorBench) for benchmarking vector search / KNN workloads, alongside a PgVectorBenchConfig/VectorBenchConfig, VectorCommand CLI entry point, and VectorBenchScenario main-flow integration.
• Adds a large set of new QueryBuilders for DDL/DML/DQL against boolean, int, and real feature vectors, including native PostgreSQL variants under queryBuilder/postgres.
• Adds RecallEvaluator to compute and write recall metrics (using a ground-truth CSV) and DataGenerator/PgDataGenerator for synthetic vector data generation. (usable via CLI)
• Adds vector.properties documenting available configuration parameters and metrics (including renaming ip to inner_product).

Bug Fixes

• Race condition in CsvWriter.writeLine