Add parameterization for top level only

src/feature_creation/feature_space/FeatureSpace.cpp

src/feature_creation/feature_space/FeatureSpace.hpp

src/feature_creation/node/operator_nodes/OperatorNode.hpp

...perator_nodes/abs/parameterize_top_lev_absolute_value.cpp

...perator_nodes/abs/parameterize_top_lev_absolute_value.hpp

...lowed_operator_nodes/abs/parameterized_absolute_value.cpp

...lowed_operator_nodes/abs/parameterized_absolute_value.hpp

...des/abs_diff/parameterize_top_lev_absolute_difference.cpp

...des/abs_diff/parameterize_top_lev_absolute_difference.hpp

...ator_nodes/abs_diff/parameterized_absolute_difference.cpp

...ator_nodes/abs_diff/parameterized_absolute_difference.hpp

...s/allowed_operator_nodes/add/parameterize_top_lev_add.cpp

...s/allowed_operator_nodes/add/parameterize_top_lev_add.hpp

...or_nodes/allowed_operator_nodes/add/parameterized_add.cpp

...or_nodes/allowed_operator_nodes/add/parameterized_add.hpp

...s/allowed_operator_nodes/cb/parameterize_top_lev_cube.cpp

...s/allowed_operator_nodes/cb/parameterize_top_lev_cube.hpp

...or_nodes/allowed_operator_nodes/cb/parameterized_cube.cpp

...or_nodes/allowed_operator_nodes/cb/parameterized_cube.hpp

...ed_operator_nodes/cbrt/parameterize_top_lev_cube_root.cpp