Allow mesh highlight and filtering via Spreadsheet view

Spreadsheet view has a great visual debugging potential: that is, to allow row selection or filtering to be viewed in the 3D viewport, enabling visual troubleshooting natively.

For geometry nodes, this means potentially introduce a post-process step between GN output and Viewport display, so that users can filter geometry and instances, given settings in spreadsheet view or cursor interaction with rows.

Example usage:

• Display only selected edge;
• Filter and Display a mesh by index number;
• Mask and Display some rows of the geometry;

All these are possible via custom node groups, but it is my belief that nothing can beat a fast-click in spreadsheet.

While currently spreadsheet are mostly considered a view for GN output and Object data, my idea suggests it can also be used to config how these data are displayed, which can unlock a lot of potentials.

(Note: in my suggestion, Spreadsheet cannot output data back into GN, to avoid any cyclic dependency, it is perhaps best to implemented it before viewport display.)