KIP-1321 — Headers aware StreamPartitioner

Accepted Kafka 4.4 Streams

Adds a `partitions(topic, key, value, Headers, numPartitions)` default method to `StreamPartitioner` that delegates to the existing overload, deprecating the header-less variant since 4.4 and threading headers through the related KafkaStreams metadata query paths. Partitioning for sink and repartition topics currently cannot see record headers, breaking the end-to-end header availability that KIP-1271 establishes from source through transformations and state stores.

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