Python: Move Python language pack tooling to external repo

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.

python/tools/pre-finalize.cmd

@@ -0,0 +1,11 @@
+@echo off
+
+type NUL && "%CODEQL_DIST%\codeql" database index-files ^
+    --include-extension=.yaml ^
+    --include-extension=.yml ^
+    --size-limit=5m ^
+    --language yaml ^
+    -- ^
+    "%CODEQL_EXTRACTOR_PYTHON_WIP_DATABASE%"
+
+exit /b %ERRORLEVEL%