IRenderInstancedLabels
Internal interface to enable adding labels that are related to an instanceableGraphicItem.
            
void AddInstancedLabel(string label, VertexType vertexType, int vertIndex, int instanceIndex, Guid BaseTessellationId)
Adds a label to the render package, but first transforms the label by the transform matrix of the 
            relevant graphicItem.
            
Number of instances for a particular baseTessellation type(cuboid, sphere etc)
            
            