Modernized enumeration helpers on Python 3.11+.

- use @enum.property

https://docs.python.org/3/library/enum.html#enum.property

- use @enum.nonmember

Using @property on an enum class does not yield the expected result.
do_not_call_in_templates attribute works because a @property instance
is truthy. We can make this a literal True value as expected by using
@enum.nonmember in Python 3.11+.

https://docs.python.org/3/library/enum.html#enum.nonmember

- used enum.IntEnum/StrEnum

Python 3.11+ has ReprEnum which uses int.__str__() and str.__str__()
for __str__() in the `IntEnum` and `StrEnum` subclasses. We can emulate
that for Python < 3.11.

https://docs.python.org/3/library/enum.html#enum.ReprEnum
https://docs.python.org/3/library/enum.html#enum.IntEnum
https://docs.python.org/3/library/enum.html#enum.StrEnum

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