[mypyc] Handle non extention classes with attribute annotations for forward defined classes #18577
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This PR makes
add_non_ext_class_attr_ann
behave the same way standard python handles modules withfrom __future__ import annotations
by using string types. With this we can reference types declared further in the file. But since this will change in future versions of python, let's only do this for forward references, for types that are defined further down in the same module.This also works with string type annotations.
Fixes mypyc/mypyc#992