Use factory pattern for creating \ activating \ model binding a controller in ControllerActionInvoker

[pranavkm]

We established a pattern of using delegates that close over state in the factory, activator and model binder for pages. This moves the onus of caching and managing state from individual components to a single piece in the ActionInvokerProvider. We should do something similar with controllers.

[pranavkm]

FYI @Eilon \ @rynowak

[pranavkm]

Fixed in c5f771d