add API to register DataTranslator

fixes #2434

Author: Faithcaio

src/main/java/org/spongepowered/api/data/DataManager.java

@@ -158,6 +158,15 @@ public interface DataManager {
      */
     <T> Optional<DataTranslator<T>> translator(Class<T> objectClass);
 
+    /**
+     * Registers a {@link DataTranslator} for the desired class.
+     *
+     * @param objectClass The class of the object type being managed
+     * @param translator The translator for the desired class object
+     * @param <T> The type of object
+     */
+    <T> void registerTranslator(Class<T> objectClass, DataTranslator<T> translator);
+
     /**
      * Creates a new {@link DataContainer} with a default
      * {@link org.spongepowered.api.data.persistence.DataView.SafetyMode} of