secure publishing to pypi

[ssbarnea]

Implement multi steps described in https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/ for publishing packages to pypi to for all our projects.

[ssbarnea]

Example of projects that are already using secured pipelines: pylibssh / cheroot / yarl / sphinxcontrib-towncrier