KIP-220 — Add AdminClient into Kafka Streams' ClientSupplier

Accepted Kafka 1.1 StreamsAdmin

Adds AdminClient to the Kafka Streams KafkaClientSupplier interface so users can inject a custom AdminClient instance and Streams can use it for internal topic management, replacing the internal StreamsKafkaClient. Streams had duplicated admin functionality in StreamsKafkaClient that predated the public AdminClient, and lacked a hook for users to supply a custom configured instance.

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