[HXCS-1166] add templateRef to SnackBarData interface

lib/core/src/lib/snackbar-content/snack-bar-data.ts

@@ -15,6 +15,8 @@
  * limitations under the License.
  */
 
+import { TemplateRef } from '@angular/core';
+
 export interface SnackBarData {
     actionLabel?: string;
     actionIcon?: string;
@@ -22,4 +24,5 @@ export interface SnackBarData {
     message: string;
     showAction?: boolean;
     callActionOnIconClick?: boolean;
+    templateRef?: TemplateRef<any>;
 }