Constructs a ViewsHandlerManager object.
string $type: The plugin type, for example filter.
\Traversable $namespaces: An object that implements \Traversable which contains the root paths keyed by the corresponding namespace to look for plugin implementations,
public function __construct($type, \Traversable $namespaces) {
$this->discovery = new ViewsHandlerDiscovery($type, $namespaces);
$this->discovery = new CacheDecorator($this->discovery, "views:{$type}", 'views_info');
$this->factory = new ContainerFactory($this);
}