[Bug] Blocking bug with Python < 3.8

[LeDocteurDesBits]

There is a bug with old version of Python (< 3.8). The functions get_args and get_origin of the dataclass package are missing (because implemented in Python 3.8). The program won't start without these two functions.

I also noticed that some distributions always run Python 3.7 (Debian for instance). It means that the program wouldn't run on these distributions even if the user's packages are "up-to-date".

A solution can be to implement an alternative version of these two functions and check the Python's version. If it's below 3.8 then we could use our handmade functions, otherwise we would use the ones in the dataclass package. It hurts to develop such a ugly fix but I guess we don't have much solution if we want smersh-cli to run on almost every distribution.