Check and populate filesize and checksum during ingestion

Please refer to https://gitlab.opengroup.org/osdu/subcommittees/data-def/work-products/schema/-/blob/master/E-R/dataset/File.Generic.1.0.0.md

• data.TotalSize
• data.DatasetProperties.FileSourceInfo.FileSize
• data.Checksum

It would be useful for the Ingestion process to handle population of these fields in an automated manner.

Ensure that the size is captured in "bytes" as per "description" in Data Definition page.

cc - @Keith_Wall