Add processed statistics

There are processing statistics attached to the investigation. It could be shown, as least, for managers to understand how processed data is being uploaded to the data portal.

      "__fileCount": "891",
      "__volume": "46014384314",
      "__datasetCount": "68",
      "__sampleCount": "47",
      "__elapsedTime": "0",
      "Id": "98884",
      "IsCancelled": "false",
      "__acquisitionDatasetCount": "35",
      "__processedDatasetCount": "33",
      "__processedFileCount": "72",
      "__acquisitionVolume": "45491073539",
      "__processedVolume": "523310775",
      "__acquisitionFileCount": "819"