add function that converts the chart data/series to a feature set

[tomwayson]

Proposed API:

const { fields, features } = chart.toFeatureSet();

We are doing something similar in the Hub to render a table as an alternative to the chart for a11y.

If there's broader interest, I could add it to cedar itself.

[tomwayson]

Hm... I guess a feature set doesn't always have fields and should at a minimum include the features and geometryType

https://developers.arcgis.com/documentation/common-data-types/featureset.htm

So maybe that's not the best name/concept for this since the thing that's tricky is converting the series() to fields and None of the features would have a geometry, much less a geometryType.

🤷‍♂️