fix(grid):Grid service wasn't being reset (#3068)

* fix(grid):Grid service wasn't being reset

* fix(service):Fix the initial service state

Services with mode specific state differed in internal state between
initial and subsequent load.  This fix address that structurally by
allows the mode to store/manage service state, but makes the
responsibility of service state central to the service.

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

@@ -136,7 +136,7 @@ class CornerstoneViewportService implements IViewportService {
   public destroy() {
     this._removeResizeObserver();
     this.viewportGridResizeObserver = null;
-    this.renderingEngine.destroy();
+    this.renderingEngine?.destroy?.();
     this.viewportsDisplaySets.clear();
     this.renderingEngine = null;
     cache.purgeCache();