Notable mostly for being the first v2-only backend under the new location of

src/python/pants/backend2

. Feel free to bikeshed that location; See https://docs.google.com/document/d/1E6a7nKq5Lf1G-VRS987ZT77KYkR5DT8JNxb9x4I4xEA/edit?usp=sharing for context.