Allow format() for types UUID to handle string input

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeUUIDBase.java

@@ -35,6 +35,11 @@ abstract class ScalarTypeUUIDBase extends ScalarTypeBase<UUID> implements Scalar
     return true;
   }
 
+  @Override
+  public String format(Object value) {
+    return String.valueOf(value);
+  }
+
   @Override
   public String formatValue(UUID value) {
     return value.toString();