more work on sql and superset representation

mitm_tooling/data_types/data_types.py

mitm_tooling/extraction/__init__.py

mitm_tooling/representation/intermediate_representation.py

mitm_tooling/representation/sql_representation.py

mitm_tooling/transformation/__init__.py

mitm_tooling/transformation/df/__init__.py

..._tooling/transformation/df/intermediate_transformation.py

mitm_tooling/transformation/superset/dataset_definition.py

...ooling/transformation/superset/superset_representation.py

test/something.py

test/test_to_df.py