Add a DOM function for generating the "stats" metadata.

Review Request #11743 — Created July 23, 2021 and submitted — Latest diff uploaded

Information

DiffX
master

Reviewers

This introduces DiffX.generate_stats(),
DiffXChangeSection.generate_stats(), and
DiffXFileSection.generate_stats(). These are used to generate metadata
containing useful statistics on the diff, such as the number of files,
changes, inserts/deletes, and changed lines in a diff.

Callers can call this immediately prior to writing the DiffX to a
stream, in order to provide this information for consumers of the diff.

Unit tests pass on Python 2 and 3.

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