Add an intermediate pending state for widget messages (#323)

* Add an intermediate pending state for widget messages

* Remove unnecessary setTimeout

* Rename method

app/javascript/widget/helpers/uuid.js

@@ -0,0 +1,10 @@
+const getUuid = () =>
+  'xxxxxxxx4xxx'.replace(/[xy]/g, c => {
+    // eslint-disable-next-line
+    const r = (Math.random() * 16) | 0;
+    // eslint-disable-next-line
+    const v = c === 'x' ? r : (r & 0x3) | 0x8;
+    return v.toString(16);
+  });
+
+export default getUuid;