[Tool] Pretty print reachables

[prabhu]

We can extract the explainer script from depscan and offer it as a pretty table print for reachables slices.

https://github.com/owasp-dep-scan/dep-scan/blob/master/depscan/lib/explainer.py#L58

[prabhu]

We can offer some ways to aggregate flows based on sources, sinks, tags, purls etc.