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Class to represent an item on the job queue.
Set the key of the job as a String
Set the processing time-out of the job, after which the message will be visible to other workers
Set the processing start time.
Set the item receipt info that will be used to acknowledge processing of the item with the JobQueue. At present all the JobQueue implementations can use a string for this field, but in the future it can be replaced by a more complex object or AutoOneOf if needed.