Minimize dependencies for the setup.py script, this
facilitates use in development mode and with legacy
install processes.
Here we remove the toml requirement at the cost of specifying the
project name directly.

If AIDGE_BUILD_GEN= is in environment the default build backend
is used.

fix: re set ninja as default build backend for python except if AIDGE_BUILD_GEN is set in environment

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