KIP-1048 — Improve kafka-consumer-perf-test to benchmark single partition

Discussion ConsumerTesting

Extends kafka-consumer-perf-test to support consuming from a single specified partition via a new --partition flag, enabling partition-level throughput and latency benchmarking. The tool previously subscribed to all partitions, making it impossible to isolate per-broker or per-partition performance and diagnose hardware-level issues (e.g., a faulty switch affecting one broker).

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