KIP-221 — Enhance DSL with Connecting Topic Creation and Repartition Hint

Accepted Kafka 2.6 Streams

Allows Kafka Streams DSL users to specify a `repartitionFactor` hint on repartition operations and to explicitly name and configure repartition topics via a `Repartitioned` object, giving control over the number of repartition topic partitions independent of the upstream sub-topology. Without this, downstream parallelism was rigidly tied to upstream source partition counts, preventing optimal scaling of stateful operations.

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