KIP-1088 — Replace KafkaClientSupplier with KafkaClientInterceptor

Discussion Streams

Replaces the `KafkaClientSupplier` interface in Kafka Streams with a new `KafkaClientInterceptor` that wraps clients after construction rather than supplying them whole, preserving the runtime's ability to build clients using internal APIs. As Kafka Streams moves toward using internal consumer primitives (KIP-1071) it can no longer treat client creation as a black-box user concern without losing the ability to co-develop clients and Streams internals.

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