KIP-646 — Serializer API should support ByteBuffer

Discussion Client

Extends the Serializer interface with a new serialize(topic, headers, data) overload returning ByteBuffer, and updates the Partitioner interface to accept ByteBuffer, enabling zero-copy serialization that avoids allocating intermediate byte arrays. Kafka's Serializer API returned only byte[], requiring a copy from any ByteBuffer-based encoder before the result could be placed in the producer record buffer.

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