cache_property has been added in py3.8 [1]
To support cache_property in py3.7 the implementation from 3.8 has been
copied to compat.py. This code can be cleanup with EOL of py3.7.
[1] https://docs.python.org/3/library/functools.html#functools.cached_property
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
