Implement route caching speed improvements

[dunhamjared]

From my understanding, the awesome route caching improvements from Laravel has yet to be implemented into the Lumen project.

It would be nice to have this for Lumen as well.

Related: laravel/framework#31188

[dunhamjared]

I swapped out FastRoute\simpleDispatcher with FastRoute\cachedDispatcher and ran:

for ($i = 0; $i < 800; $i++) {
    $router->get('/test-'.$i.'/{foo}', 'TestController');
}

...with the following controller:

class TestController extends Controller
{
    public function __invoke($foo)
    {
        return 'Invoked - '.$foo;
    }
}

...and command:

 ab -t 10 -c 1 http://127.0.0.1/test-799/foo

And here are the average requests per second:

[driesvints]

We have no plans to change the router in Lumen.