Add project to test PyPI

[tim-schilling]

The Django Commons release action supports testing the release of the package to test.pypi.org. This requires the project to exist there which requires a manual upload.

The test release GHA code can be found here: https://github.com/django-commons/django-commons-playground/blob/main/.github/workflows/release.yml#L97

[bckohan]

done: https://test.pypi.org/project/django-typer/