Moved result interface from struct grid to struct grid scalar data access

Use this concept to configure result data values to use for vizualization. Created data access object for RegGrid.
p4#: 20334

ApplicationCode/ModelVisualization/RivGridPartMgr.h

@@ -69,6 +69,8 @@ private:
 
 private:
     size_t                                      m_gridIdx;
+    cvf::cref<RigGridBase>                      m_grid;
+
     cvf::ref<cvf::Transform>                    m_scaleTransform;
     float                                       m_opacityLevel;
     cvf::Color3f                                m_defaultColor;