Automatically generate fillColumns and symbolColumns from table

The major ask is that the HistogramPlot and ScatterPlot render properly when viewProperties.fillColumns or viewProperties.symbolColumns is null, defaulting to whatever is in the fluxGroupKeyUnion property within the FromFluxResult passed in. The functionality to automatically fill these is currently held in a selector somewhere, which obfuscates the relationship between the view properties being generated by the `createView` function and the requirements of these components.

Trace how createView produces view properties and locate the selector that currently derives fillColumns and symbolColumns. Start with HistogramPlot, ScatterPlot, and the FromFluxResult fluxGroupKeyUnion property. Done means both plots render correctly when either view property is null and the values default from fluxGroupKeyUnion.

Written by the indexing model from the issue text.