KIP-558 — Track the set of actively used topics by connectors in Kafka Connect

Accepted Kafka 2.5 Connect

Adds a `/connectors/{name}/topics` REST endpoint to Kafka Connect that returns the set of Kafka topics actively used by a connector since it was started, tracking topic consumption and production at the framework level. There is no existing mechanism to determine which topics a source connector dynamically produces to or which exact topic names a regex-subscribed sink connector is consuming.

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