Need CD workflow to publish project

[mrl280]

We need to publish to TestPyPI, PyPI, and Conda.

Conda distribution is being discussed in #9.

Note: PyPI and TestPyPI are separate platforms, and require separate accounts.

This workflow will need to call our build and deployment CI workflow (#15), and publish the resulting build to all distribution channels. We may want to run the workflows to publish docs (#19 ) and notify stakeholders (#20) as part of the automated publication process?

[mrl280]

Regarding publishing to PyPI, approvals for organizations appear to still be on hold: https://discuss.python.org/t/pypi-organization-account-roadmaps/14699/21?page=2.