Fix pydantic issues that raise errors in validation

[MitchellAV]

Active PR for fixing various pydantic issues

• each pydantic class should have a name field which uses the Field class with frozen=True
• should field should have proper defaults with correct typing
  i.e. field of str should not have a default of None, etc...
• abstract methods from base classes need to have consistent argument ordering

more to be found...

run against mypy --strict to identify each pydantic issue

[MitchellAV]

@dylanmkennedy Fixes are still required before bax visualizer extension is useable.

• still in draft until fixed
• update pypi once all validation and testing has been confirmed locally to be fixed in badger