Treat django.utils.functional.cached_property like functools.cached_property

[allanlewis]

pylint-dev/pylint#4594 taught Pylint to consider functions decorated with functools.cached_property like properties so that invalid-overridden-method isn't reported for them if they override abstract properties. Would it be possible for pylint-django to do the same for django.utils.functional.cached_property for those of us using Python versions before 3.8, when cached_property was added to functools?