KIP-191 — KafkaConsumer.subscribe() overload that takes just Pattern

Accepted Kafka 1.0 Consumer

Adds a subscribe(Pattern pattern) overload to KafkaConsumer that uses a no-op ConsumerRebalanceListener, making pattern-based subscriptions usable without boilerplate. The only existing pattern-based subscribe required passing a ConsumerRebalanceListener even when no rebalance handling was needed, forcing users to instantiate a dummy listener.

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