KIP-376 — Implement AutoClosable on appropriate classes that want to be used in a try-with-resource statement

Accepted Kafka 2.2 Client

KIP-376 makes `KafkaStreams`, `KafkaChannel`, `ConsumerInterceptor`, `MetricsReporter`, and several other Kafka and Streams components implement `java.lang.AutoCloseable` so they can be used in try-with-resources blocks. These classes hold resources and have `close()` methods but did not implement the interface, preventing resource-safe usage patterns and complicating test teardown.

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