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

stdlib/weakref.pyi

@@ -45,6 +45,7 @@ class WeakMethod(ref[_CallableT], Generic[_CallableT]):
     def __call__(self) -> _CallableT | None: ...
     def __eq__(self, other: object) -> bool: ...
     def __ne__(self, other: object) -> bool: ...
+    def __hash__(self) -> int: ...
 
 class WeakValueDictionary(MutableMapping[_KT, _VT]):
     @overload