just use rdflib

[majidaldo]

since the point of terminusdb is to use standard formats (in turn leads to standard tooling), i'm not sure why there's a lot of python code here. what's so specific to terminusdb that the following wouldn't be robust?

client.get_docs > rdflib.Graph.parse(..., format='json-ld') ?> dataframe
client.insert_docs < rdflib.Graph.serialize(..., format='json-ld') <? dataframe

?: multiindex can recover the hierarchy