feat: :sparkles: Override __str__ method for all top-level classes

[joconnor-ecaa]

Description

Instead of printing all attributes of a class, we now show

ClassName: self.name (id=self.id), e.g. Node: Germany (id=DEU)

Note that I've also caught a couple of other things here: some missing tests and missing id properties.

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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