KIP-562 — Allow fetching a key from a single partition rather than iterating over all the stores on an instance

Discussion Kafka 2.5 Streams

KIP-562 adds a `partition` parameter to `KafkaStreams.store()` so callers can query a specific partition of a local state store rather than always querying all local partitions. The existing API forces the store wrapper to iterate over all partitions on the instance, making it impossible for a query-routing layer (as designed in KIP-535) to execute a targeted sub-query against a single active or standby partition replica.

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