feat(window-level-region): add window level region tool (#4127)

extensions/cornerstone/src/initCornerstoneTools.js

@@ -37,6 +37,7 @@ import {
   SplineROITool,
   LivewireContourTool,
   OrientationMarkerTool,
+  WindowLevelRegionTool,
 } from '@cornerstonejs/tools';
 
 import CalibrationLineTool from './tools/CalibrationLineTool';
@@ -84,6 +85,7 @@ export default function initCornerstoneTools(configuration = {}) {
   addTool(SplineROITool);
   addTool(LivewireContourTool);
   addTool(OrientationMarkerTool);
+  addTool(WindowLevelRegionTool);
   addTool(PlanarFreehandContourSegmentationTool);
 
   // Modify annotation tools to use dashed lines on SR
@@ -138,6 +140,7 @@ const toolNames = {
   LivewireContour: LivewireContourTool.toolName,
   PlanarFreehandROI: PlanarFreehandROITool.toolName,
   OrientationMarker: OrientationMarkerTool.toolName,
+  WindowLevelRegion: WindowLevelRegionTool.toolName,
   PlanarFreehandContourSegmentation: PlanarFreehandContourSegmentationTool.toolName,
 };