Update export cpp with new registry methods.

aidge_export_cpp/export_registry.py

aidge_export_cpp/kernels/activation.hpp

aidge_export_cpp/kernels/batchnorm.hpp

aidge_export_cpp/kernels/convolution.hpp

aidge_export_cpp/kernels/fullyconnected.hpp

aidge_export_cpp/operators.py

...xport_cpp/templates/configuration/activation_config.jinja

...port_cpp/templates/configuration/convolution_config.jinja

..._export_cpp/templates/configuration/elemwise_config.jinja

...t_cpp/templates/configuration/fullyconnected_config.jinja

aidge_export_cpp/templates/network/environment.jinja

aidge_export_cpp/templates/network/network_forward.jinja