Operation.Operator (and subclasses) causes issues with typehints.

[LonelyCat124]

When we use a typehint of type BinaryOperation.Operator it instead poitnts to Operation.Operator (which is a dummy class).

The options to fix it are:

1. Use quoted type hint, i.e. "BinaryOperation.Operator" or similar.
2. (Less certain) Update the Operator subclass to be a defined class, similar to IntrinsicNode.Intrinsic, so it is recognized correctly as a class and not just a value(?).