Introduce action status scoped custom code (#1277)

* Allow providing a custom code with an action status feedback to give more fine grained device specific details.
* Add ddi rest docs for new optional status code value.
* Provide new code value via mgmt api. Fix review findings.
* Fix failing tests

Signed-off-by: Michael Herdt <Michael.Herdt@bosch.io>
Co-authored-by: Stefan Behl <stefan.behl@bosch.io>

hawkbit-repository/hawkbit-repository-core/src/main/java/org/eclipse/hawkbit/repository/builder/AbstractActionStatusCreate.java

@@ -25,9 +25,13 @@ import org.springframework.util.StringUtils;
  *            update or create builder interface
  */
 public abstract class AbstractActionStatusCreate<T> {
+
     protected Status status;
+
     protected Long occurredAt;
 
+    protected Integer code;
+
     protected List<@ValidString String> messages;
 
     protected Long actionId;
@@ -48,6 +52,12 @@ public abstract class AbstractActionStatusCreate<T> {
         return (T) this;
     }
 
+    public T code(final int code) {
+        this.code = code;
+
+        return (T) this;
+    }
+
     public T messages(final Collection<String> messages) {
         if (this.messages == null) {
             this.messages = messages.stream().map(StringUtils::trimWhitespace).collect(Collectors.toList());