✨(react) add DataGrid, SimpleDataGrid components

The DataGrid component can be considered as the core one, which provides
a full controlled component, but more complicated than SimpleDataGrid
which is based on DataGrid. SimpleDataGrid is intended to give a simple
ready-to-use data grid for client side data for example.

packages/react/src/index.scss

@@ -1,6 +1,8 @@
 @import "cunningham-tokens";
 @import '@openfun/cunningham-tokens/default-tokens';
+@import './components/Accessibility';
 @import './components/Button';
+@import './components/DataGrid';
 @import './components/Forms/Input';
 @import './components/Loader';
 @import './components/Pagination';