Stdlib: add many missing __hash__ and __eq__ methods (#10464)

stdlib/enum.pyi

@@ -190,6 +190,7 @@ class Enum(metaclass=EnumMeta):
     # and in practice using `object` here has the same effect as using `Any`.
     def __new__(cls, value: object) -> Self: ...
     def __dir__(self) -> list[str]: ...
+    def __hash__(self) -> int: ...
     def __format__(self, format_spec: str) -> str: ...
     def __reduce_ex__(self, proto: Unused) -> tuple[Any, ...]: ...