Identify class cycle groups and prioritize

[jimbethancourt]

Identify class cycle groups and prioritize based on average churn of all classes involved in the cycle.

Identify all classes referred to by each class with JavaParser / JavaSymbolSolver (package name + class name)
Identify strongly connected components (cycles) with JGraphT: https://jgrapht.org/guide/UserOverview#graph-algorithms

[jimbethancourt]

duplicate of #12