Move Louvain

[daxpryce]

The louvain.py file is one method for creating a global partition structure of the graph. We already plan on including leiden's algorithm for global partitioning, and there could be others.

There's also the ability to partition a graph based off the embeddings, which is currently present in the topologic.embedding.clustering package. A more-unified package like topologic.partitioning should probably be created, with louvain.py being moved into it. We should also rename the functions from best_partition to louvain() and induce_graph_by_communities should be specifically made to be not in the louvain.py module.

In the future I envision this partitioning package to also include ways of taking the output of an embedding clustering and inducing a graph from that as well.

In short, we have some short sighted naming going on, and we should use this opportunity to fix it.