feat(customization): new customization service api (#4688)

extensions/cornerstone/src/customizations/viewportClickCommandsCustomization.ts

@@ -0,0 +1,15 @@
+export default {
+  cornerstoneViewportClickCommands: {
+    doubleClick: ['toggleOneUp'],
+    button1: ['closeContextMenu'],
+    button3: [
+      {
+        commandName: 'showCornerstoneContextMenu',
+        commandOptions: {
+          requireNearbyToolData: true,
+          menuId: 'measurementsContextMenu',
+        },
+      },
+    ],
+  },
+};