KIP-960 — Support single-key_single-timestamp Interactive Queries (IQv2) for Versioned State Stores

Accepted Kafka 3.7 Streams

KIP-960 adds a `VersionedKeyQuery<K, V>` class to Kafka Streams IQv2 supporting single-key lookups against versioned state stores (`VersionedKeyValueStore`) with an optional `asOf(Instant)` timestamp to retrieve the value valid at a specific point in time. Versioned state stores (introduced in KIP-889) expose time-varying key-value state but lacked an interactive query interface, making the stored temporal history inaccessible from outside the topology.

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