KIP-215 — Add topic regex support for Connect sinks

Accepted Kafka 1.1 Connect

Adds a `topics.regex` configuration option to Connect sink connectors allowing them to subscribe to a dynamic set of topics via a Java regex pattern, in addition to the existing static `topics` list. Connect sinks hardcoded to a topic list require connector reconfiguration (and a rebalance) whenever new matching topics are created, making dynamic topic consumption impossible.

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