Problem: We don't have any ways of knowing what the publishing queue is doing.

Acceptance Criteria:
Add debug-level file logging for all publishing queue items into file: publishing_queue.log.
Ideally log file is found in its own directory "integration".
ideally, add log entry with timestamp, dataset_id, for add to queue, start, end, re-added, failed.
Spend up to two days Spiking on alternate approaches including JMX agents.