Add first iteration of Github Actions workflow to build and publish to Python Package Index (PyPI)

[pfaraone]

This PR introduces a Github Action workflow that publishes tagged commits to PyPI and untagged commits to TestPyPi unconditionally if there is a version change

Usage

git add README.md
git commit -m "Added foo section to the README"
git tag 0.1.5
git push origin 0.1.5

Prerequisites

• PyPI and TestPyPI API tokens generated and then set as PYPI_API_TOKEN and TEST_PYPI_API_TOKEN respectively (PyPI currently set, TestPyPi pending)

Related links / References

• https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/

Testing

Identical workflow executed on my fork of Deltacat - https://github.com/pfaraone/deltacat/actions

Discussion

• Dependency installation from requirements.txt is taking 55 seconds (45% of total execution time) because we are using a dependency range instead of a pinned dependency (e.g., "pyarrow >= 8.0.0")

[raghumdani]

Looks good overall. Let's see if we can make requirements.txt changes.

[raghumdani]

Looks good

[rkenmi]

LGTM

[valiantljk]

lgtm