Column Styles Updates Do Not Fire perspective-config-update Event Correctly

[jkusa]

Column Styles Updates Do Not Fire perspective-config-update event

Steps to Reproduce:

1. cd examples; yarn start react-monaco
2. Open config panel
3. Change a column to be a Bar format
4. Notice that the config object in the editor on the left does not update

Expected Result:

Updates to the data table column styles should fire a perspective-config-update event on the perspective-viewer element.

Actual Result:

Looks like the perspective-config-update event is currently firing on the perspective-viewer-data-grid element, not the perspective-viewer element.