Add missing message property on ToastProps type (#4569)

Co-authored-by: Jacob Minor <jacob.minor@3squared.com>

components/lib/toast/Toast.d.ts

@@ -238,6 +238,11 @@ export interface ToastProps {
      * @deprecated since v3.26.0. Use 'pt' property.
      */
     closeButtonProps?: ButtonHTMLAttributes | undefined;
+    /**
+     * Used to access message options.
+     * @type {ToastMessageOptions}
+     */
+    message?: ToastMessageOptions;
     /**
      * Used to pass attributes to DOM elements inside the component.
      * @type {ToastPassThroughOptions}