Adds logic to the reconcile function to handle the optional infinite requeue (Issue #826) (#23)

This PR is one of two to implement [Issue #826](aws-controllers-k8s/community#826) 
[Link to the code-generator PR ](aws-controllers-k8s/code-generator#95)

### Testing
I tested the change by enabling it for applicationAutoscaling (ScalableTarget) - [you can check the generated code on this branch just for reference. ](aws-controllers-k8s/applicationautoscaling-controller#21)

Author: mbaijal

pkg/runtime/reconciler.go

@@ -15,7 +15,8 @@ package runtime
 
 import (
 	"context"
-
+	"time"
+	
 	"github.com/go-logr/logr"
 	"github.com/pkg/errors"
 	corev1 "k8s.io/api/core/v1"
@@ -279,15 +280,21 @@ func (r *resourceReconciler) Sync(
 		return err
 	}
 	for _, condition := range latest.Conditions() {
-		if condition.Type == ackv1alpha1.ConditionTypeResourceSynced &&
-			condition.Status != corev1.ConditionTrue {
-			rlog.Debug(
-				"requeueing resource after finding resource synced condition false",
-			)
-			return requeue.NeededAfter(
-				ackerr.TemporaryOutOfSync,
-				requeue.DefaultRequeueAfterDuration,
-			)
+		if condition.Type == ackv1alpha1.ConditionTypeResourceSynced {
+			if condition.Status == corev1.ConditionTrue {
+				if duration := r.rmf.RequeueOnSuccessSeconds(); duration > 0 {
+					rlog.Debug(
+						"requeueing resource after resource synced condition true",
+					)
+					return requeue.NeededAfter(nil, time.Duration(duration)*time.Second)
+				}
+			} else {
+				rlog.Debug(
+					"requeueing resource after finding resource synced condition false",
+				)
+				return requeue.NeededAfter(
+					ackerr.TemporaryOutOfSync, requeue.DefaultRequeueAfterDuration)				
+			}
 		}
 	}
 	return nil

pkg/types/aws_resource_manager.go

@@ -70,6 +70,7 @@ type AWSResourceManager interface {
 
 // AWSResourceManagerFactory returns an AWSResourceManager that can be used to
 // manage AWS resources for a particular AWS account
+// TODO(jaypipes): Move AWSResourceManagerFactory into its own file
 type AWSResourceManagerFactory interface {
 	// ResourceDescriptor returns an AWSResourceDescriptor that can be used by
 	// the upstream controller-runtime to introspect the CRs that the resource
@@ -89,4 +90,7 @@ type AWSResourceManagerFactory interface {
 	) (AWSResourceManager, error)
 	// IsAdoptable returns true if the resource is able to be adopted
 	IsAdoptable() bool
+	// RequeueOnSuccessSeconds returns true if the resource should be requeued after specified seconds
+	// Default is false which means resource will not be requeued after success.
+	RequeueOnSuccessSeconds() int
 }