This PR takes the approach of "never use the class dict". Instead, we repurpose the unused tp_cache field to hold annotation information. It can hold any of:
NULL: the class has no annotations
a dict: the class has __annotations__, but no __annotate__
a callable: the class has only __annotate__
a tuple: the class has both annotate and annotations
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Like #120719, this is an experimental way to fix the issues discussed in python/peps#3847.
This PR takes the approach of "never use the class dict". Instead, we repurpose the unused
tp_cachefield to hold annotation information. It can hold any of:__annotations__, but no__annotate____annotate__