Add leiden native code to topologic

[daxpryce]

Leiden University advanced the community identification algorithm first developed by Universite catholique de Louvain in the paper From Louvain to Leiden: guaranteeing well-connected communities, as well as provided a Java reference implementation released under the MIT license.

We now have a working version of this written in Rust and can use pyo3 to provide it as a native Python module. This should be pulled into topologic for others to use.

It should be noted that this initial release is still somewhat fluid, but we're excited to bring this to everyone!

[nicarq]

hi Dax Pryce (@daxpryce) are you folks still thinking of releasing the Rust implementation?

[bdpedigo]

it's available via a python interface in graspologic, the sucessor to this package https://github.com/graspologic-org/graspologic the underlying rust implementation lives in https://github.com/graspologic-org/graspologic-native

[daxpryce]

it is as Ben Pedigo (@bdpedigo) said!