Add a hook to get resource controller only

[otakustay]

Current the only way to get controller for a specific resource is useResource and useConstantResource, but their return values are tuples containing [value, controller].

In some cases, we only need resource controller to perform a expire or refresh of cache entry, such as to delete an item in a list from ListItem component.

We need useResourceController and useConstantResourceController hooks to satisfy these scenarios.