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/scrolledtext.pyi

@@ -1,4 +1,4 @@
-from tkinter import Frame, Grid, Misc, Pack, Place, Scrollbar, Text
+from tkinter import Frame, Misc, Scrollbar, Text
 from typing import Any, Optional
 
 # The methods from Pack, Place, and Grid are dynamically added over the parent's impls