Bringing in the code to atarashi means we have to maintain it. Whereas getting it as a dependency, we do not have to care for it anymore. It is just additional burden in my opinion.
Not a major point but using Cython means additional build time for atarashi, compared to just downloading the wheel from pypi in case of extrnal library.
feat(DLD): Add native damerauLevenDist agent
Closes #90