[openpyxl] Annotate Worksheet and other items (#9892)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

stubs/openpyxl/@tests/stubtest_allowlist.txt

@@ -3,3 +3,7 @@ openpyxl.descriptors.slots.AutoSlotProperties.__new__
 
 # 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.*