KIP-208 — Add SSL support to Kafka Connect REST interface

Accepted Kafka 1.1 ConnectSecurity

Adds TLS/SSL and optional mutual TLS (mTLS) authentication to the Kafka Connect REST interface via new `listeners.https.*` and `rest.ssl.*` configs. The Connect REST API transmits connector configurations (which often contain passwords) over plain HTTP, and has no authentication mechanism to prevent unauthorized connector creation or modification.

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