Use `JGraphT` for graph datastructures

[bakhtos]

This PR implements the following

• All Intermediate representation models are moved to edu.university.ecs.lab.common.models.ir; NetworkGraph and Edge are moved to edu.university.ecs.lab.common.models.sdg
• NetworkGraph is renamed to ServiceDependencyGraph and Edge to EndpointCallEdge
• createGraph() function which parsed MicroserviceSystem data to ServiceDependencyGraph is now a constructor
• ServiceDepedencyGraph subclasses DirectedMultigraph and EndpointCallEdge subclasses DefaultDirectedEdge from JGraphT graph library.
  • An EdgeSerializer class is implemented to serialize the new edges.
• Anti-pattern implementations that use ServiceDependencyGraph are modified accordingly to use the graph public interface
  • In particular, buildAdjacency, which was duplicated between three antipatterns, is now a public method of ServiceDependencyGraph

I could not test the antipattern Main() neither as-is nor by directly providing the sample IR.json file, so please test the antipatterns before merging.

[bakhtos]

It is ready for review, but I will need to squash some intermediate commits before merging, hence the draft state