[Setup] Remove cache files from package

Remove pycache files and generated egg-info from
sources list in MANIFEST.in.
Note that it would be better to explicitly include only
the required files instead of recursively including all
and then excluding cache files.

MANIFEST.in

 include MANIFEST.in
 include LICENSE
 include README.md
-recursive-include aidge_core *
 include setup.py
 include version.txt
+recursive-include aidge_core *
+global-exclude __pycache__/*
+global-exclude *.egg-info/*