JIRA: https://jira.spring.io/browse/INT-3663
Previously the `ChannelSecurityInterceptorBeanPostProcessor` was populated with direct `BeanDefinition`s for `ChannelSecurityInterceptor`s.
It caused an `early access to BeanFactory`.
The issue has been introduced by the `ChannelSecurityInterceptorFactoryBean`
* Rework `SecurityIntegrationConfigurationInitializer` do not populate `BeanDefinition`s to the `ChannelSecurityInterceptorBeanPostProcessor`, but just `bean names`
* Redesign `ChannelSecurityInterceptorBeanPostProcessor` to the `AbstractAutoProxyCreator`
* Introduce `SecuredChannel` annotation to be used on the `@Bean` level for `MessageChannel` definition
* Move `access policy` mapping to the `SecuredChannel` annotation
Address PR comments
Document `@SecuredChannel` annotation
b6cfd4fa76