Skip stack level hook for stack if prior stack level change set hook succeeded

For stack level hooks, customers are able to return a new status that allow stack level hooks that execute against a stack to skip with a successful status. The idea is that if a stack hook invoked against a change set succeeds, there is no need to invoke against the stack once the change set is processed.

Author: brianlaoaws

src/main/java/software/amazon/cloudformation/proxy/OperationStatus.java

@@ -18,5 +18,6 @@ public enum OperationStatus {
     PENDING,
     IN_PROGRESS,
     SUCCESS,
+    CHANGE_SET_SUCCESS_SKIP_STACK_HOOK,
     FAILED
 }

src/main/java/software/amazon/cloudformation/proxy/hook/HookStatus.java

@@ -18,5 +18,6 @@ public enum HookStatus {
     PENDING,
     IN_PROGRESS,
     SUCCESS,
+    CHANGE_SET_SUCCESS_SKIP_STACK_HOOK,
     FAILED
 }