KIP-126 — Allow KafkaProducer to split and resend oversized batches.

Accepted Kafka 1.0 Producer

Adds logic to `KafkaProducer` to detect when an estimated-compressed batch exceeds `max.request.size` or `message.max.bytes` after actual compression and automatically split and retry the oversized batch. The producer's compression ratio estimator can underestimate compression for a specific batch, causing a `RecordTooLargeException` at send time even though individual records were within limits.

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