Use better way to set up controller with Manager

[Jeffwan]

In traditional flow, any reconciler initialization logic needs to updated in cmd/main.go which is not that clean. Now, we borrow the similar way adopted in kruise. There're few major changes

1. Add Add interface and registry the controller together at pkg/controller/controller.go and finish setup with manager
2. Create newReconciler method in every controller file.

After this change, whenever we need add a new controller or update controller initialization logic, we do not need to make the change here cmd.go and controller.go, most of the logics will be modified inside it's controller file.