Add pyodide support

[MusicalNinjaDad]

References:

• comments & source from Handle case where output_dir does not already exist on macos & windows pypa/cibuildwheel#1851
• https://blog.pyodide.org/posts/rust-pyo3-support-in-pyodide/
• https://pyodide.org/en/stable/development/building-and-testing-packages.html

To Do

• add pyodide build target via cibw
• add automated pyodide testing in pipeline (if not available for free from cibw)
• add local build & test via pyodide docker or similar
• use pyodide online repl to install from ADO and test interactively
• write up in how-to
• offer doc updates to cibw (e.g. re pyodide-specific options)