Type openpyxl functions module and its usages (#10322)

stubs/openpyxl/@tests/stubtest_allowlist.txt

@@ -1,13 +1,14 @@
-# "cls" argument has wrong name in implementation.
-openpyxl.descriptors.slots.AutoSlotProperties.__new__
+# The actual runtime definition depends on what else is installed
+# (lxml, defusedxml, et_xmlfile)
+openpyxl.xml._functions_overloads
+openpyxl.xml.functions.Element.__iter__
+openpyxl.xml.functions.fromstring
+openpyxl.xml.functions.iterparse
+openpyxl.xml.functions.tostring
 
 # Requires numpy to be installed
 openpyxl.utils.dataframe
 
-# Element can be imported from lxml or xml.etree, so the attributes can
-# differ at runtime.
-openpyxl.xml.functions.Element.*
-
 # Fake getters
 openpyxl\.descriptors\..*\.__get__
 

stubs/openpyxl/@tests/test_cases/check_nested_descriptors.py

@@ -20,9 +20,9 @@ from openpyxl.descriptors.nested import (
     NestedString,
     NestedText,
     NestedValue,
-    _HasTagAndGet,
 )
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml._functions_overloads import _HasTagAndGet
 from openpyxl.xml.functions import Element
 
 _ = object()  # More concise discard object for casts