More RUM Explorer Visualizations

[trieloff]

Adds

• pie chart (user agent)
• horizontal bar chart (urls)
• sankey diagram (checkpoints)

to the list of visualizations

• feat(rum-explorer): allow drilldown in some facets
• feat(rum-explorer): add horizontal bar chart as alternative hero visualization
• feat(rum-explorer): nicer icon for drilldown
• fix(rum-explorer): keep current drilldown mode
• refactor(rum-explorer): import external dependencies as ES6 modules
• feat(rum-explorer): introduce piechart viz for user agents
• feat(rum-explorer): allow to drill up
• wip(rum-explorer): sankey diagrams

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[langswei]

Good stuff. One thing that looks strange to me on the sankey is a bar in the middle of the chart (around the top checkpoint) is larger than the sum of the flows coming from the left. I see what looks like a catch-all "Other" that might be usable so we have a consistent total size of each segment left to right. Thoughts?

[trieloff]

That happens when inflows and outflows from a node don't add up exactly. I've seen it on some sites, but not consistently.