KIP-967 — Support custom SSL configuration for Kafka Connect RestServer

Discussion ConnectSecurity

Extends Kafka Connect RestServer SSL configuration to honor ssl.engine.factory.class (with listeners.https. and admin.listeners.https. prefixes), enabling custom SslEngineFactory implementations for the Connect REST API. Previously, Connect's REST server only supported file-based keystores, blocking organizations that use hardware security modules or custom certificate providers.

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