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/default/package.json

@@ -6,7 +6,7 @@
   "license": "MIT",
   "repository": "OHIF/Viewers",
   "main": "dist/index.umd.js",
-  "module": "src/index.js",
+  "module": "src/index.ts",
   "publishConfig": {
     "access": "public"
   },