This is essentially the contents of `language-packs/python/tools` with some minor
modifications to account for the changed location.
Of note: we explicitly exclude the `recorded-call-graph-metrics` director that
was already present in `python/tools`. When we revisit this directory for some
cleanup (e.g. to get rid of the `lgtm` references), we'll probably want to switch
to an explicit list of sources to include.
