Michael Droettboom 2844aa6a8e
Support comparing two sets of pystats (GH-98816)
This adds support for comparing pystats collected from two different builds.

- The `--json-output` can be used to load in a set of raw stats and output a
  JSON file.
- Two of these JSON files can be provided on the next run, and then comparative
  results between the two are output.
2022-11-04 10:15:54 +00:00
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