[new feature] Toast: add onOpened option

packages/toast/en-US.md

@@ -107,5 +107,6 @@ toast2.clear();
 | loadingType | Loading icon type, can be set to `spinner` | `String` | `circular` |
 | duration | Toast duration(ms), won't disappear if value is 0 | `Number` | `3000` |
 | className | Custom className | `String | Array | Object` | - |
-| onClose | onClose callback function | `Function` | - |
+| onOpened | Callback function after opened | `Function` | - |
+| onClose | Callback function after close | `Function` | - |
 | getContainer | Return the mount node for Toast | `String | () => HTMLElement` | `body` |