Is your feature request related to a problem? Please describe.
StrEnum (new in py3.11 https://docs.python.org/3.11/library/enum.html#enum.StrEnum) "is the same as Enum, but its members are also strings and can be used in most of the same places that a string can be used."

this is a feature request for incorporating this class which will hopefully simplify the codebase in many places such as

however StrEnum is not available for other versions of python that monai supports, some customized class should be introduced. see also the discussion https://discuss.python.org/t/built-in-strenum/4192

cc @SachidanandAlle