gaufre: follow disclosure aria pattern

- add aria attributes on load with the gaufre api script so that people
already using la gaufre don't necessarely *have* to update their code
- add the aria patterns in given code examples/react components. In some
cases, our small page load JS code isn't enough: for example on SPAs
where gaufre buttons might be loaded after page load.

thanks @inseo

packages/integration/src/components/Gaufre.tsx

@@ -23,6 +23,8 @@ export const Gaufre = ({ variant }: Props) => {
       type="button"
       className={`lasuite-gaufre-btn ${variantClass} lasuite-gaufre-btn--vanilla js-lasuite-gaufre-btn`}
       title={t("gaufre.label")}
+      aria-expanded="false"
+      aria-controls="lasuite-gaufre-popup"
     >
       {t("gaufre.label")}
     </button>