Add support for uploading wheels to PyPi

[superm1]

In order to make gaia more accessible I think it would be a good idea to upload it to PyPi. Here's a github action that will:

• build the wheel
• save wheel as an artifact
• On tag: upload artifact to Pypi
• On tag: sign with sigstore
• On tag: add signed wheel to Github release

Of course this requires registering with pypi and sigstore for all this to work. But when it's all in place users should be able to do this to install:

sudo apt install pipx
pipx install amd-gaia
pipx ensurepath

They can already install lemonade from PyPI. So after installing lemonade pipx should put both in $PATH and let users spin up lemonade server and gaia.