Feature Request: Improve Dataset version differencing performance

[qqmyers]

Overview of the Feature Request The DatasetVersionDifference class uses some double loops over FileMetadata/DataFiles from the old and new versions which are known to be inefficient (the code has a todo). Making this faster would improve the performance of editing a dataset with many files as well as displaying the versions table on the dataset page.

Are you thinking about creating a pull request for this feature?
PR to follow