Merge edges while grouping

When edges are displayed in larger environments the topology view can be difficult to understand. To help remove clutter on the screen we can aggregate the edges from individual nodes within a group to a single line between node groups layer.

Check with PF team / jephilli@redhat.com about this feature

Help for development if needed then implements on our side

WIP: https://github.com/patternfly/react-topology/pull/30