Update index.d.ts (#43635)

Adding rawErrors to the individual widget so errors can be rendered inside the widget

types/react-jsonschema-form/index.d.ts

@@ -124,6 +124,7 @@ declare module 'react-jsonschema-form' {
         onBlur: (id: string, value: boolean | number | string | null) => void;
         onFocus: (id: string, value: boolean | number | string | null) => void;
         label: string;
+        rawErrors: string[];
     }
 
     export type Widget = React.StatelessComponent<WidgetProps> | React.ComponentClass<WidgetProps>;