KIP-281 — ConsumerPerformance: Increase Polling Loop Timeout and Make It Reachable by the End User

Accepted Kafka 2.0 Consumer

KIP-281 increases the default `kafka-consumer-perf-test.sh` polling loop timeout from 1 second to 10 seconds and exposes it as a configurable `--timeout` command-line parameter. On topics with large partition counts, iterating over polled batches takes longer than 1 second, causing the benchmark tool to exit prematurely and report far fewer consumed records than actually exist.

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