Port Euler-Maruyama to v5

[fonnesbeck]

Updated example from PyMC3 and fixed some bugs. The biggest change is that E-M no longer supports vector-valued states, so the second example has been removed.

• 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--711.org.readthedocs.build/en/711/

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