Revert "feat : split the whole pyproject.toml back in multiple pieces as setuptools generates bugs when both are coexisting"

This reverts commit e653863d.

This reverts commit f982c0b7.

feat : split the whole pyproject.toml back in multiple pieces as setuptools generates bugs when both are coexisting

update version and changelog

See merge request eclipse/aidge/aidge_core!120

0.2.1

See merge request !119