KIP-1306 — Extend ConsumerRebalanceListener with Consumer-Aware methods

Accepted Kafka 4.5 ConsumerClient

Adds consumer-aware rebalance callbacks that pass a restricted RebalanceConsumer view (position, seek, commitSync, pause/resume) to onPartitionsRevoked/Assigned, omitting poll(), close(), subscribe() and wakeup(). The existing ConsumerRebalanceListener signatures expose no consumer, forcing constructor injection of an unrestricted Consumer reference where calling rebalance-unsafe methods compiles fine; Spring Kafka, SmallRye and Micronaut each built the same workaround independently.

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