KIP-1196 — Introduce group.coordinator.append.max.buffer.size config

Accepted Kafka 4.3 ConsumerBroker

Introduces a group.coordinator.append.max.buffer.size config to cap the group coordinator's append cache buffer size independently of the broker's message.max.bytes setting. The current implementation derives the buffer ceiling from message.max.bytes, so deployments with large max message sizes (common in event pipelines) create excessive memory pressure on the group coordinator and risk OutOfMemoryError.

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