Python biding for operators / declare_registrable function call

Problem description

I'm not sure if this is a problem, but I noticed that the following operators are not declared as "registerable"

BitShift, Cast, ConstantOfShape, Flatten, Identity, Ln, LRN, Operator, OperatorTensor, Pop, Stack, Tanh, TopK

because there is no call to "declare_registrable" in the corresponding aidge_core/python_biding/operator/pybind_*.cpp files.