Added Conv 4-bits testing

aidge_export_cpp/static/rescaling_utils.hpp

aidge_export_cpp/static/typedefs.hpp

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

...export_cpp/templates/configuration/batchnorm_config.jinja

aidge_export_cpp/templates/configuration/concat_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/configuration/matmul_config.jinja

...xport_cpp/templates/configuration/reducemean_config.jinja

aidge_export_cpp/templates/configuration/slice_config.jinja

...ort_cpp/templates/configuration/transpose_ND_config.jinja

aidge_export_cpp/templates/data/inputs.jinja

aidge_export_cpp/templates/data/parameters.jinja

aidge_export_cpp/unit_tests/test_export.py