Add pypi_dependencies_formulae.json

[botantony]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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Homebrew/brew#21731

[chenrui333]

would it be possible to do DSL rather than json?

[MikeMcQuaid]

@chenrui333 Anything is possible 😂 What are your thoughts on pros and cons of either approach?

[p-linnane]

We removed the PyPI formula mappings file within the last 6 months, with the goal to try to stop having logic outside the formulae themselves.