Add "defaultAction" to TemplateColumn type

Author: Hyunje Jun

lib/types.ts

@@ -1217,6 +1217,10 @@ export type TemplateColumn = {
    * - Max: 60 characters (message with an image or title)
    */
   text: string;
+  /**
+   * Action when image is tapped; set for the entire image, title, and text area
+   */
+  defaultAction?: Action;
   /**
    * Action when tapped (Max: 3)
    */