Add Windows Support

[dblock]

Coming from opensearch-project/opensearch-plugins#95, add Windows support.

• Passing CI on Windows
• Documentation

[anirudha]

not applicable

[dblock]

Adding Windows CI will ensure that the plugin actually works on Windows, we can't assume that it works because it's theoretically portable.

[dblock]

I don't believe integration tests are running, and integration tests are very much part of CI. Reopening. Please close when this and any other gaps between Linux/Windows CI/CD are covered.

[peterzhuamazon]

Hi, just want to make sure this issue is closed, if all the tasks are completed.

Thanks.

[CEHENKLE]

@anirudha Can you please address @dblock's questions?

[CEHENKLE]

@anirudha Poke!

[CEHENKLE]

@anirudha Can you address @dblock's question?

[rupal-bq]

Closing this as there are no gaps between Linux/Windows CI/CD.