Publish to PyPI

[reegnz]

Please publish to PyPI so gcpdiag can be installed with pip (or pipx), and so that the community can build distro packages out of it (homebrew, AUR, other linux distros).

Reasoning:
Current installation instructions suggest installing this tool with curl. A more sophisticated distribution method would be to enable distros to build their own packaging, but for that a base requirement is for this tool being able to publish to PyPI (so it follows common python packaging standards).

Packaging tools (like Homebrew) make it easier to package up tools written in python if it's install-able through PyPI.

[jdomeracki]

I'd strongly suggest publishing at least a placeholder package to prevent a potential name squatting scenario.

Currently anyone can register a malicious project on PyPi counting on people attempting to install this module via pip (as you can see https://pypi.org/search/?q=gcpdiag isn't taken)

What's more, following code snippet from the docs may mislead users into believing that it's actually already published:
https://github.com/GoogleCloudPlatform/gcpdiag/blob/main/website/content/en/docs/development/architecture.md?plain=1#L177-L178