[Build] Align build to new aidge_core dependencies

Simplify dependencies for binding and allow both TEST and PYBIND on
when Python embedded interpreter is available.
This aligns to the new aidge_core dependencies which are self-sufficient.
Update cmake requirements to >=3.18+ in order to support missing
Python embedded interpreter.

This change requires the installed aidge_core library to include the
merge request aidge_core!187