Edge features from LobsterNeighbors

## TODO
- Starting from LobsterPy's Analysis().chemenv.get_light_structure_environment() (lse from LobsterNeighbors), extract edge-related features (distances, and, if nodes are only cations, cation-anion-cation angles, connectivities, ...).
- Add these edge-related features to
    - Description().write_description() 
    - featurize module
    - Analysis().condensed_bonding_analysis (?)