Add row styling

Summary:
Added styling / coloring to the new logs plugin, to bring it closer to feature completeness. Made the colum headers slightly more compact

Also made the API more foolproof by introducing the `useAssertStableRef` hook, that will protect against accidentally passing in props that would invalidate rendering every time.

Reviewed By: passy

Differential Revision: D26635063

fbshipit-source-id: 60b2af8db3cc3c12d8d25d922cf1735aed91dd2c

desktop/flipper-plugin/src/ui/datatable/useDataTableManager.tsx

@@ -246,6 +246,10 @@ export function useDataTableManager<T>(
     [currentFilter, dataSource],
   );
 
+  // if the component unmounts, we reset the SFRW pipeline to
+  // avoid wasting resources in the background
+  useEffect(() => () => dataSource.reset(), [dataSource]);
+
   return {
     /** The default columns, but normalized */
     columns,