Sunburst: make the thickness of the arcs configurable

[derrickbeining]

Is your feature request related to a problem? Please describe.
I need to be able to customize the thickness of the arc rings in the Sunburst component.

Describe the solution you'd like
Add a prop (e.g. "arcRingWidth") which has the type number | (idk: { depth: number }) => number to expose control over the thickness of the arc rings of the Sunburst. The number variant would make all rings the same thickness. The function variant would allow computing the thickness of the ring based on the depth of the ring.

Describe alternatives you've considered
Reimplementing the whole arc layer via the layers prop.

Additional context

I'm realizing now that this feature could obviate the need for the innerRadius prop described in #1649.

Here's an example from the Sunburst from highcharts. It let's you control ring thickness via the levelSize configuration: https://jsfiddle.net/hrb9t27w/

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[stale]

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