KIP-1046 — Expose producer.id.expiration.check.interval.ms as dynamic broker configuration

Discussion BrokerProducer

Promotes `producer.id.expiration.check.interval.ms` from an internal static config to a dynamic public broker configuration. Without this, operators cannot tune the frequency of producer ID expiration checks at runtime, making `producer.id.expiration.ms` dynamic-only in name since the check interval stays fixed.

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