Add python build interface to run python scripts/notebooks

[sgreenbury]

Include a build interface (pyproject.toml) for reproducible running of python scripts and notebooks.

• [x] Add pyproject.toml with poetry and confirm package requirements
• [x] Check all scripts and notebooks can be run upon installation
• [x] Add install instructions

[dabreegster]

@mfbenitezp is the author and main user of the notebooks, so tagging FYI