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Use log4j for structured logging.

Peter Fischer requested to merge log4j-instead-of-slf4j into main

slf4j is only provided in version 1.x by the flink runtime, but that version does not support structured logging. However, log4j 2.x is also provided by flink and that already supports structured logging.

Change-Id: I70cfa524767efca9e0eb7481e83074648bbd9429

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