Addition of beginner level notebook on Bayesian Hypothesis Testing

[drbenvincent]

Addition of new notebook (beginner level) covering Bayesian Hypothesis Testing.

Demand for content on hypothesis testing was established in #349.

This PR is intended to form a beachhead, to get a notebook in place which covers these issues. We can then potentially elaborate and provide more detail in later iterations. That said, I'd be very happy to get feedback about errors or any important pointers for improvement. I don't think this is terrible, but I certainly think it can be improved. What are the minimal set of things for this to be good enough to merge? Can come back to more ambitious changes in the near future :)

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• Notebook follows style guide https://docs.pymc.io/en/latest/contributing/jupyter_style.html
• PR description contains a link to the relevant issue:
  • a tracker one for existing notebooks (tracker issues have the "tracker id" label)
  • or a proposal one for new notebooks
• Check the notebook is not excluded from any pre-commit check: https://github.com/pymc-devs/pymc-examples/blob/main/.pre-commit-config.yaml

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📚 Documentation preview 📚: https://pymc-examples--751.org.readthedocs.build/en/751/

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[fonnesbeck]

Useful to point out that there are an infinite number of intervals of a given probability, and that we are interested in the narrowest one.

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[fonnesbeck]

Looks like a rebase is needed