[CI] Upload Python package as artifact

[koenvervloesem]

Description:

Uploads the Python package built from a PR as an artifact, useful when we need a user to test a change. This doesn't require the user to set up a development environment. We can just let the user download the Python package from the artifacts in a GitHub Action run such as https://github.com/theengs/decoder/actions/runs/7309688303 and let them run pip install <PACKAGE_FILE>.

Checklist:

• [X] The pull request is done against the latest development branch
• [X] Only one feature/fix was added per PR and the code change compiles without warnings
• [X] I accept the DCO.

[DigiH]

Great addition for test build distribution! Thanks