KIP-941 — Range queries to accept null lower and upper bounds

Accepted Kafka 3.7 Streams

Changes RangeQuery.withRange(K lower, K upper) to treat null bounds as absent (using Optional.ofNullable), so null lower/upper bounds implicitly widen to unbounded rather than throwing or using null as a literal key. Callers receiving nullable query parameters from HTTP clients had to write explicit null-checking logic before constructing a RangeQuery.

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