KIP-839 — Provide builders for KafkaProducer/KafkaConsumer and KafkaStreams

Discussion Client

Proposes fluent builder classes for `KafkaProducer`, `KafkaConsumer`, `KafkaAdminClient`, and `KafkaStreams` that accept typed dependencies (serializers, metrics reporters, interceptors) via named methods rather than a raw `Properties` map. This enables constructor injection from DI frameworks like Spring and eliminates the need for stringly-typed property keys in application code.

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