p72dennisxu

**Is your feature request related to a problem? Please describe.** Currently a derived csp.Struct class is not able to override the types of fields defined in the base class, which...

**Describe the solution you'd like** C++ implementation of the csp.Struct `from_dict`/`from_json` that have better performance than the current python implementation: https://github.com/Point72/csp/blob/main/csp/impl/struct.py#L250.