KIP-992 — Proposal to introduce IQv2 Query Types: TimestampedKeyQuery and TimestampedRangeQuery

Discussion Kafka 3.7 Streams

Introduces TimestampedKeyQuery and TimestampedRangeQuery as explicit IQv2 query types for timestamped key-value stores, and fixes KeyQuery/RangeQuery to always return plain V from both kv-store and ts-kv-store. Previously, KeyQuery returned ValueAndTimestamp<V> against a ts-kv-store, creating type-safety issues and unintuitive API behavior.

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