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.
python · Nov 4, 2022 · 2844aa6 · 2844aa6
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diff --git a/Doc/using/configure.rst b/Doc/using/configure.rst
@@ -131,7 +131,8 @@ General Options
    Turn on internal statistics gathering.
 
    The statistics will be dumped to a arbitrary (probably unique) file in
-   ``/tmp/py_stats/``, or ``C:\temp\py_stats\`` on Windows.
+   ``/tmp/py_stats/``, or ``C:\temp\py_stats\`` on Windows. If that directory
+   does not exist, results will be printed on stdout.
 
    Use ``Tools/scripts/summarize_stats.py`` to read the stats.