Add missing Dataset field serializers

[aaraney]

fixes #377

Changes

• Add missing dmod.core.dataset.Dataset field serializers (fixes Add field_serializers for Dataset field without serializable types #377).

[aaraney]

This depends on #381

[robertbartel]

@aaraney, I've marked the issue as no longer blocked. Probably this just needs the branch rebased.

[aaraney]

@robertbartel, rebased and ready for review! Thanks in advance!

[robertbartel]

There's one thing that needs to be cleared up before I approve, although I probably am just missing something about how Pydantic works.

[robertbartel]

I think uuid should have something akin to the lambda used for manager_uuid, although perhaps it's declaration needs adjustment. That is:

uuid: Optional[UUID] = Field(default_factory=uuid4)

If I follow correctly, this implies the possibility of explicitly receiving None. It's possible there's a subtlety about Pydantic I'm missing that requires this to be declared as Optional even though it really isn't (although if that's the case, it's bothersome).

[aaraney]

Great catch. You are right. Changing that now.

[aaraney]

Great catch! Thanks for the review, @robertbartel! I just pushed the required change. This is ready for another quick review.