Publish python wheel to PyPi

[finnegancarroll]

Description

• Add CI workflow to publish python wheel to PyPI
  https://pypi.org/project/opensearch-protobufs/
• Add some additional metadata to the wheel
• Change name and imports to better match "opensearch protobufs" naming convention.
• Add python wheel to github release artifacts.

Issues Resolved

opensearch-project/.github#376

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[finnegancarroll]

@karenyrx can you take a look when you have a chance?

Mistakenly approved, thanks.

[peterzhuamazon]

Rename release-drafter to publish-release yml and move all the java content + pypi content there.
Make sure you release pypi first before release draft, which will call jenkins to release java.

Thanks.

[finnegancarroll]

Hi @karenyrx @peterzhuamazon. I've made the following changes:

• Move release drafter to publish-release.yml - This workflow will be responsible for all release artifacts (Github release/Maven central/PyPI)
• Add python wheel to Github release artifacts
• In contrast to maven central artifacts which are picked up by Jenkins from Github release artifacts, use pypa/gh-action-pypi-publish to publish python artifacts directly.
• Bump min python version for the wheel to 3.10 (3.8/9 are deprecated).

This should address the previous comment here and keep everything in a single workflow.

Please take a look when convenient and lmk of any additional comments.