I frame widget created (#1436)

* feat: iframe widget created

* feat: iframe widget - updated test cases

* feat: iframe widget - lint errors fixed

* feat: iframe widget - lint errors fixed

* feat: iframe widget - comments

* feat: iframe widget - lint errors fixed

* feat: iframe widget - lint errors fixed

* feat: iframe widget - comments

* feat: iframe widget - comments

Author: jyothishjose6190

projects/observability/src/shared/dashboard/widgets/iframe/iframe-widget-renderer.component.ts

@@ -18,7 +18,7 @@ export class IframeWidgetRendererComponent extends WidgetRenderer<IFrameWidgetMo
   public urlSafe?: SafeResourceUrl;
 
   public constructor(
-    public sanitizer: DomSanitizer,
+    private readonly sanitizer: DomSanitizer,
     @Inject(RENDERER_API) api: RendererApi<IFrameWidgetModel>,
     changeDetector: ChangeDetectorRef
   ) {

projects/observability/src/shared/dashboard/widgets/iframe/iframe-widget.module.ts

@@ -8,7 +8,6 @@ import { IFrameWidgetModel } from './iframe-widget.model';
   declarations: [IframeWidgetRendererComponent],
   imports: [
     CommonModule,
-
     DashboardCoreModule.with({
       models: [IFrameWidgetModel],
       renderers: [IframeWidgetRendererComponent]