KIP-769 — Connect APIs to list all connector plugins and retrieve their configuration definitions

Accepted Kafka 3.2 Connect

KIP-769 adds a `connectorsOnly=false` query parameter to `GET /connector-plugins` so it lists all installed plugin types (connectors, SMTs, converters, header converters, predicates), and adds a new `GET /connector-plugins/{plugin}/config` endpoint returning the plugin's configuration definition. Previously, only connector plugins were discoverable via the REST API; other plugin types had to be found by inspecting the Connect worker's classpath or documentation.

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