refactor: weighted graph #387
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miparnisari
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Description
Add ability to generate the DOT of a weighted graph and visualize it.
A follow-up PR needs to be sent to add tests. The current string output from the DOT generator produce flaky tests (the IDs for each edge and node vary between runs, but verified manually that the actual content is correct). I believe the root cause is that we are not using gonum's graph builder.
References
Most of the code was adapted from #351.