Look into refactoring NN featurization #37
Description
the feature create step might need some refactoring, it reads a bit like it does some unnecessary table operations joining dataframes from molecule objects and then re-exploding them again. Lets comb this area for the core operations and refactor if necessary for simplicity primarily (but side-effect of possible performance)
see body of: https://github.com/ssec-jhu/bluephos/blob/main/bluephos/tasks/sdf2feature.py#L416