DependencyGraphDumper should be configurable

In a sense, we just accumulate what all it prints out (see class history), but this should be in fact somehow configurable.

Maybe refactor all the output into "decorator" (appender)? And the let ctor just accept a collection of them (with some predefined collections for some defaults)? As then, user/caller is fully in charge what the dumper is writing out, plus, is extensible with original "decorator" idea.

Original decorator idea was that I had a lookup table of some "extra info", and decorator was basically appending info from that lookup table.