KIP-521 — Enable redirection of Connect's log4j messages to a file by default

Accepted Kafka 2.4 Connect

Changes Kafka Connect's default log4j configuration to write worker logs to a file (`connect.log`) in addition to stdout, mirroring the behavior of Kafka broker and ZooKeeper startup scripts. By default, Connect logs only to stdout, meaning logs are lost unless the process is managed by a supervisor that captures stdout, and log rotation is unavailable without manual log4j reconfiguration.

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