KIP-837 — Allow MultiCasting a Result Record.

Accepted Kafka 3.4 Streams

Adds a `multicastTo(List<Integer> partitions)` method to `KStream` in Kafka Streams DSL that routes a single record to multiple specified partitions on the sink topic atomically. Multicasting to N partitions currently requires producing N copies of the record with a custom partitioner, wasting network and storage resources.

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