[core] No binding for Node copy in Python

Required prerequisites

• Make sure you've read the documentation. Your issue may be addressed there.
• Search the issue tracker and discussions to verify that this hasn't already been reported. +1 or comment there if it has.

What commit version of aidge do you use

• aidge_core: 0.2.0, dev branch

Problem description

I'm trying to copy a graph Node in python to create an identical node but with different inputs but this does not seem possible. A C++ method exist but is not binded with Python.

Additionally, as Node cannot be pickled, copy.deepcopy does not work.