KIP-495 — Dynamically Adjust Log Levels in Connect

Accepted Kafka 3.6 ConnectAdmin

Adds a dynamic log level REST API (`PUT /admin/loggers/{logger}`) to Kafka Connect workers, allowing log levels to be changed at runtime without restarting the worker. Previously, changing log levels in Connect required editing `log4j.properties` and restarting the worker, which often masked bugs by resetting in-memory state.

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