Set up pypi

[shinich1]

Describe the feature you'd like
Set up CI for pypi releases

https://github.com/TeamGraphix/graphix/blob/master/.github/workflows/release.yml

[shinich1]

@thierry-martinez don't we want to set up pypi so that we can simply require this package in graphix repo (where needed), rather than cloning and setting up?

[thierry-martinez]

This repository, graphix-symbolic, uses the same GitHub Action (https://github.com/TeamGraphix/graphix-symbolic/blob/master/.github/workflows/release.yml), and I agree that we should make a release at some point. However, I don't think the graphix CI should check the released version. Generally, we prefer to verify that the upstream versions of both repositories work together. Typically, if a breaking change in graphix requires a fix in graphix-symbolic, we want to ensure everything functions properly before making new releases of both packages.

[shinich1]

sounds good. let's go with the proposed plan.