post-voting env triad value set serialization

[turbomam]

UPDATE: I might be able to remove some of the dependencies added to pyproject.toml

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@pkalita-lbl can you accept these changes, especially the new dev dependencies imports in pyproject.toml?

This is in support of the post-voting phase of environmental context/environmental triad vale sets

@sierra-moxon I think you has talked about doing code review and providing documentation at some point. I have added a lot of inline Markdown in the notebook, but would still welcome your review

@cmungall I've added you as a reviewer since you showed interest in annotating the post-voting notebooks, and for you to sign off on the new soil env_local_scale enumeration

[mslarae13]

I believe this is getting moved out of submission-schema and into a different repo.
I'll review when the new PR is opened