KIP-968 — Support single-key_multi-timestamp Interactive Queries (IQv2) for Versioned State Stores 

Accepted Kafka 3.7 Streams

KIP-968 adds a `MultiVersionedKeyQuery<K, V>` class and `VersionedRecordIterator<V>` interface to Kafka Streams IQv2, enabling single-key queries against versioned state stores that return all versions within a time range (with optional upper/lower bounds and result ordering). KIP-960 added single-timestamp point lookups; this KIP extends IQv2 to support range-over-time queries including tombstone representation via a `validTo` field on `VersionedRecord`.

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