Add missing attributes of type (#2544)

All these attributes can be seen when using `dir(type)`.

In the future we should be discussing if certain methods on object (like
__eq__) should really be there. IMO this should be defined on type where it
actually also appears when using `dir`.

stdlib/2/builtins.pyi

@@ -66,9 +66,17 @@ class classmethod(object):  # Special, only valid as a decorator.
     def __get__(self, obj: _T, type: Optional[Type[_T]] = ...) -> Callable: ...
 
 class type(object):
-    __bases__ = ...  # type: Tuple[type, ...]
-    __name__ = ...  # type: str
-    __module__ = ...  # type: str
+    __base__: type = ...
+    __bases__: Tuple[type, ...] = ...
+    __basicsize__: int = ...
+    __dict__: Dict[str, Any] = ...
+    __dictoffset__: int = ...
+    __flags__: int = ...
+    __itemsize__: int = ...
+    __module__: str = ...
+    __mro__: Tuple[type, ...] = ...
+    __name__: str = ...
+    __weakrefoffset__: int = ...
 
     @overload
     def __init__(self, o: object) -> None: ...
@@ -81,8 +89,6 @@ class type(object):
     def __new__(cls, name: str, bases: Tuple[type, ...], namespace: Dict[str, Any]) -> type: ...
     def __call__(self, *args: Any, **kwds: Any) -> Any: ...
 
-    # Only new-style classes
-    __mro__ = ...  # type: Tuple[type, ...]
     # Note: the documentation doesnt specify what the return type is, the standard
     # implementation seems to be returning a list.
     def mro(self) -> List[type]: ...