Plumb through extra_data provided by diff parsers.
Review Request #11295 — Created Nov. 20, 2020 and submitted — Latest diff uploaded
This change makes it so custom diff parsers (associated with specific
SCMTools) can provide additional extra_data to be set on the FileDiff.
This change does the plumbing to take the extra_data from the parser and
store it in the database.
Used in conjunction with other changes.