Revert "Revert "Support accessing underlying attributes in RayTaskErr… #14449
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Allows users to interact with RayTaskError exception objects as they would with the underlying exception object. This makes it easier to convert existing code to run on Ray.
The only downside here is if the original object is not serializable, this will throw a separate exception with a traceback saying it couldn't be serialized. I don't see this being a significant issue because exception objects should generally be simple and not contain e.g., mutexes, but we can handle it here by only storing the traceback for non-serializable objects if need be.
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