[Feat] Add getTooltipContent() to layer so that if present the Deck overlay can use it

[Kilowhisky]

Target Use Case

Having the master deck layer control visualization of sub-layer data causes an inversion of control and concerns issue. Having this present means that the layers gain control of visualization of the popup data.

Proposal

Add this to the layer definition so it is available at all layers.

getTooltipContent?: (pickingInfo: PickingInfo) => TooltipContent;

Then at the deck main layer.

    // Let individual layers control the tooltip
    // This is the way it should be
    getTooltip(pickingInfo) {
      if (pickingInfo.layer?.props?.getTooltipContent) {
        return pickingInfo.layer.props.getTooltipContent(pickingInfo);
      }
      return null;
    },