feat(imageLoader):Add an nth image loader strategy (#10) (#3044)

* feat(imageLoader):Add an nth image loader strategy (#10)

* Updates for PR for nth menu

* performance:Prior implementation was O(n^2), taking about 50 ms

* feat:Nth image loader, added docs as requested

extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts

@@ -136,7 +136,11 @@ class CornerstoneViewportService implements IViewportService {
   public destroy() {
     this._removeResizeObserver();
     this.viewportGridResizeObserver = null;
-    this.renderingEngine?.destroy?.();
+    try {
+      this.renderingEngine?.destroy?.();
+    } catch (e) {
+      console.warn('Rendering engine not destroyed', e);
+    }
     this.viewportsDisplaySets.clear();
     this.renderingEngine = null;
     cache.purgeCache();