Windows support

[mattmoor]

We should get rules_python to a state where Bazel can enable:

                {"node": "windows-x86_64"}

... in .ci/rules_python.json.

Some early scouting of this on top of my pip_import PR reveals that there are at least some blocking issues (I believe) unrelated to my changes.

[alexeagle]

Happy Birthday #2! 🍰

[github-actions]

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