[OM] Add Python support for Objects in Fields. #5276
Merged
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This adds support for Objects in the Fields of other Objects. This is handled in the pure Python layer of the Evaluator API, which is enhanced to support recursively instantiating Objects. The functionality for creating a dataclass instance from an instantiated Object is factored out into a new helper. In the case an Object field is itself an Object, the new helper is called recursively with the child dataclass and the child Object.
A simple integration test for this behavior is added.
This uncovered undefined behavior in the previous use of shared pointers, so this patch depends on PR #5275.