feat(list): support a11y ARIA (#502)

Co-authored-by: wuhw <[email protected]>

packages/semi-ui/list/item.tsx

@@ -86,7 +86,6 @@ export default class ListItem extends PureComponent<ListItemProps> {
         }
         let content = (
             <li
-                role="list-item"
                 className={itemCls}
                 style={style}
                 onClick={handleClick}