KIP-985 — Add reverseRange and reverseAll query over kv-store in IQv2

Accepted Kafka 3.7 Streams

Adds withDescendingKeys() and withAscendingKeys() methods to RangeQuery and introduces the ResultOrder enum, enabling reverse-ordered range and all-keys queries against RocksDB and InMemoryKeyValueStore (both of which maintain sorted key order). IQv2 previously had no mechanism to retrieve results in descending key order.

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