Enable pyright for all Python 3 stubs (#5597)

* pyright: disable reportUnknownParameterType

Unknown parameter types are preferred over Any annotations for
incomplete stubs. Especially larger stubs are expected to be
incomplete for some time and it would be a shame to lose the
other pyright warnings for those stubs.

* Also disable reportUnknownVariableType

Fix problems with tkinter

* Disable reportUnknownMemberType

Fix pyright problems

stdlib/tkinter/font.pyi

@@ -1,6 +1,6 @@
 import sys
 import tkinter
-from typing import Any, List, Optional, Tuple, TypeVar, Union, overload
+from typing import Any, Optional, Tuple, Union, overload
 from typing_extensions import Literal, TypedDict
 
 NORMAL: Literal["normal"]