feat: data provenance, source and publisher

[Lkruitwagen]

Description

Implements top-level Source and Publisher objects, links them together and adds some light integration tests.

Also fixes warning related to protected model_ attribute and updates the Node docstring to refer to from_id.

Checklist

• [x] Dependencies install correctly in a clean environment and code executes;
• [x] Test coverage extended; created tests fail without the change (if possible);
• [x] All tests passing;
• [x] Commits follow a type convention (e.g. https://gist.github.com/brianclements/841ea7bffdb01346392c#type);
• [x] Extended the README, documentation and/or docstrings, if necessary;

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Name	Status	Preview	Comments	Updated (UTC)
feo-client	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 28, 2023 2:37pm