Add graphs visualization with GraphViz

[ileasile]

GraphViz-java library provides a cool Kotlin API for the rendering of the graphs, but even more importantly, it provides a way to render these graphs and .dot files. Make it possible to use this library in the kernel: either provide this functionality in lib-ext or make a separate API wrapper or contribute to the library itself or make a JSON wrapper inside the kernel.

[altavir]

There is very nice kaliningraph library by @breandan and you already have integration with it.

[ileasile]

Yes, I know, but graphviz seems to be a bit more stable solution at the moment. However, I see that kaliningraph uses graphviz under the hood

[breandan]

Kaliningraph uses Kraphviz, which uses graphviz-java, which uses viz.js, which uses Graphviz recompiled for WASM. As Kaliningraph is currently a research prototype I would not recommend using it for anything important. Depending on what you need to do, it might be better to use viz.js or a library like G6, neoviz.js or another graph visualization library. You could also reach out to @alshan who might know more about writing a ggplot-style API or wrapper.