Refactor manager internal around RunnableGroup(s)

Signed-off-by: Vince Prignano <vincepri@vmware.com>

Author: vincepri

go.mod

@@ -3,6 +3,7 @@ module sigs.k8s.io/controller-runtime
 go 1.16
 
 require (
+	github.com/davecgh/go-spew v1.1.1
 	github.com/evanphx/json-patch v4.11.0+incompatible
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/go-logr/logr v0.4.0