[FEATURE] Visualize node probes as directed graphs

[marcosnils]

Following the discussion started here https://cilium.slack.com/archives/CQRL1EPAA/p1586200540018400 I'd like to propose adding a feature to hubble to query the probe endpoint and visualize the health status information in a probably directed network graph.

Any ideas about visualizations or open source tools that can be used to add this feature are much appreciated. What I know and used in the past is Neovis.js (https://github.com/neo4j-contrib/neovis.js/) which is one of the recommendations used in Neo4j and Cytoscape (https://github.com/cytoscape/cytoscape.js) cc @luanguimaraesla