migrate from distutils (copy_tree) to something else which works pn python 3.12

[mihai2costache]

The distutils package was running in a deprecated mode within python 3.10 and 3.11 and completely removed from python 3.12. This means this module doesn't work with python 3.12 anymore.

It would really useful to update the code to use shutil.copytree instead of depending on distutils

[mihai2costache]

#12