feat: Allow configurable context menus (#2894)

* feat: Context menu

feat: Custom context menu

Adding documentation

PR updates

* fix: Capture tool exception

* PR updates

* Add fully worked out examples in the basic test mode/extension

* Fix the menu display

* fix: Make the commands on clicks much more configurable

* Wait for load before double clicking

* docs

* PR changes - nothing functional, just moving things endlessly

* PR comments

* PR changes - rename the default context menu

* Renamed the cornerstoneContextMenu to measurementsContextMenu

* Add chevron right to the sub-menus

extensions/test-extension/src/getCustomizationModule.ts

@@ -0,0 +1,14 @@
+import {
+  codingValues,
+  contextMenuCodeItem,
+  findingsContextMenu,
+} from './custom-context-menu';
+
+export default function getCustomizationModule() {
+  return [
+    {
+      name: 'custom-context-menu',
+      value: [codingValues, contextMenuCodeItem, findingsContextMenu],
+    },
+  ];
+}