Optimize annotation processing and improve performance (#1350)

Author: nakamura-to

doma-core/src/main/java/org/seasar/doma/NClobFactory.java

@@ -48,4 +48,5 @@
  */
 @Target(ElementType.METHOD)
 @Retention(RetentionPolicy.RUNTIME)
+@DaoMethod
 public @interface NClobFactory {}