Added useDateRange hook.

hooks/useDateRange.js

@@ -0,0 +1,8 @@
+import { useSelector } from 'react-redux';
+import { getDateRange } from 'lib/date';
+
+export function useDateRange(websiteId, defaultDateRange = '7day') {
+  return useSelector(
+    state => state.websites[websiteId]?.dateRange || getDateRange(defaultDateRange),
+  );
+}