JNG-6082 Refactor required validation and default value processing (#68)

[2025-01-19 19:54:06 +0100] bence.gelei: restore pom.xml change
[2025-01-16 15:08:44 +0100] bence.gelei: apply instead of copy
[2025-01-15 19:09:37 +0100] bence.gelei: rename
[2025-01-15 17:28:56 +0100] bence.gelei: default populator added
[2025-01-13 11:52:34 +0100] bence.gelei: payload traverser added
[2025-01-13 11:21:45 +0100] bence.gelei: JNG-6082 Initial feature commit

src/main/java/hu/blackbelt/judo/dao/api/DAO.java

@@ -65,6 +65,17 @@ public interface DAO<ID> {
      */
     Payload getDefaultsOf(EClass clazz);
 
+    /**
+     * <p>Apply the default values in the given payload based on the specified transfer object type.</p>
+     * <p>The default values are also applied by traversing through its relations.</p>
+     * <p>NOTE: additional fields with default values on entity type that are not targeted by a mapping from given transfer object (clazz) mapping,
+     * will not be applied</p>
+     *
+     * @param clazz   transfer object type
+     * @param payload payload
+     */
+    void applyDefaultsOf(EClass clazz, Payload payload);
+
     /**
      * Get range of a given transfer object relation.
      *