stdlib: Add many missing dunder overrides (#7231)

stdlib/optparse.pyi

@@ -161,6 +161,7 @@ class Values:
     def read_module(self, modname: str, mode: str = ...) -> None: ...
     def __getattr__(self, name: str) -> Any: ...
     def __setattr__(self, __name: str, __value: Any) -> None: ...
+    def __eq__(self, other: object) -> bool: ...
 
 class OptionParser(OptionContainer):
     allow_interspersed_args: bool