Add an interface that all applyconfigs implement

staging/src/k8s.io/apimachinery/pkg/runtime/interfaces.go

@@ -385,3 +385,9 @@ type Unstructured interface {
 	// If the items passed to fn are not retained, or are retained for the same duration, use EachListItem instead for memory efficiency.
 	EachListItemWithAlloc(func(Object) error) error
 }
+
+// ApplyConfiguration is an interface that root apply configuration types implement.
+type ApplyConfiguration interface {
+	// IsApplyConfiguration is implemented if the object is the root of an apply configuration.
+	IsApplyConfiguration()
+}