Add ComponentConfig helper alias

[christopherhein]

When implementing kubernetes-sigs/kubebuilder#722 I'm noticing that it would help to reduce the amount of dependencies that need to be imported to mutate main.go to support scaffolding.

// alias.go

import (
         // ... other imports
	cfg "sigs.k8s.io/controller-runtime/pkg/config"
)

var (
         // ... other aliases

  	// ConfigFile returns the cfg.File function for deferred config file loading,
	// this is passed into Options{}.From() to populate the Options fields for
	// the manager.
	ConfigFile = cfg.File
)

Ref #895

[christopherhein]

/cc @vincepri

[christopherhein]

/assign

[vincepri]

+1 having the helper, seems it could be useful to reduce the amount of imports