Feature request: allow customizing whether the `==` and `!=` operators are generated for classes.

By applying `[Equatable]` to my class, I noticed that the generated code includes `==` and `!=` operators.
For my use case, I would prefer to keep `==` as a reference-equality comparison and rely on the `Equals` method for per-property comparison. Is this already possible? If not, I am available to propose an implementation if you can point me in the right direction.
