KIP-508 —  Make Suppression State Queriable

Discussion Streams

Exposes interactive query access to the suppression buffer in Kafka Streams so callers can query only the finalized (emitted) records from a `KTable#suppress()` operator via a dedicated `ReadOnlyKeyValueStore`. The existing workaround of materializing the downstream table required double storage and could not provide an iterator over only the finalized state held by the suppression buffer.

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