Add GitHub actions: windows unit tests

[robsdedude]

• Adding GitHub Actions CI to run unit tests under Windows
• Work around pytest on windows not liking long test ids
  Long parametrized test_input on Windows: ValueError: the environment variable is longer than 32767 characters pytest-dev/pytest#6881
• Fix test flakiness on systems with low monotonic clock resolution
  👀️🪟️
• Fix DNS error re-write on Windows
  On windows only, the driver would re-write the DNS error when resolving Address(None, None) to be retryable, which it shouldn't.

[MaxAake]

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