KIP-366 — Make FunctionConversions deprecated

Accepted Kafka 2.1 Streams

KIP-366 deprecates the public `FunctionConversions` object in the Kafka Streams Scala API and replaces it with a private equivalent. The object was accidentally exposed in the public API but contains only internal type conversion implicits, and its public presence prevents the project from evolving the conversions without going through the KIP process.

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