feat: add auto pypi publish on new release

[TiansuYu]

• closes Automate pypi release in github actions #101
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.

[TiansuYu]

@gventuri I have written a draft. If you want to test it, you can go add a test pypi person access token as PYPI_TOKEN in github secret (which can be replaced with real ones afterwards) and switch on this section:

#  push:
#    branches:
#      - add-auto-pypi-release

to test the auto-publish.
(Unfortnately, I think the trigger on release will not work unless this yaml is on main.)

After this works, I will remove the testing part and leave only the parts for production.

[gventuri]

@TiansuYu configured everything, but cannot make it work:

There is no pypi-token.test_pypi setting.

This is actually weird, cause we are passing the key

[gventuri]

@TiansuYu if what the maintainer of the library mentioned is correct, maybe we should test with an actual release with the right repo and see whether it works!

[TiansuYu]

I will come back to this as soon as I can. In the mean time, the PR is not correct from my point of view.

Regarding the action itself. 1) fix according to the action author's suggestions 2) we can write the steps ourselves without the action's help. It is something super simple with github.