add otherProps passthrough for Alert

Author: eunicekokor

src/alert/Alert.tsx

@@ -53,6 +53,7 @@ export const Alert = ({
   onDismissClick,
   banner = false,
   extra,
+  ...otherProps
 }: AlertProps) => {
   let variantStyle = useSeverityStyle(variant);
 
@@ -61,6 +62,7 @@ export const Alert = ({
   }
   return (
     <div
+      {...otherProps}
       css={css`
         padding: ${theme.spacing.margin8}px ${theme.spacing.margin16}px;
         border-radius: 4px;