Job-Runner listens for batch completion

[donaldgray]

Have a listener for callback that Batch is finished
On receipt:

• Mark batch as complete in DB
• If there are other incomplete batches for manifest no further processing.
• If all batches are finished, populate "items" property on Manifest
  • Call DLCS; get asset details via /allImages endpoint (width, height, image-service etc to populate "items"), save to Manifest + write to S3
  • Mark ingesting as false
• Processing should happen via a 2nd queue (SNS -> SQS).
• If errors encountered in a batch - don't process any the "items", update "ingesting" property to show failure counts.