JIRA: https://jira.spring.io/browse/INT-4488
Since `PublisherAnnotationBeanPostProcessor` is quite expensive
(1.5x the CPU used by `MessagingAnnotationPostProcessor` in a simple
application)
* So not register a `PublisherAnnotationBeanPostProcessor` by default.
The `@EnablePublisher` has to be presented on the `@Configuration`
to allow the `@Publisher` AOP
* Change the `<int:annotation-config>` to require a new
`<int:enable-publisher>` sub-element for similar purpose - do not
register `PublisherAnnotationBeanPostProcessor` by default
69af967c78