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53ffe714 - [red-knot] Add basic subtyping between class literal and callable (#17469)

[red-knot] Add basic subtyping between class literal and callable (#17469) ## Summary This covers step 1 from https://typing.python.org/en/latest/spec/constructors.html#converting-a-constructor-to-callable Part of #17343 ## Test Plan Update is_subtype_of.md and is_assignable_to.md --------- Co-authored-by: Carl Meyer <carl@astral.sh>