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INT-3565 Inject Advice Chain to Direct Handlers

JIRA: https://jira.spring.io/browse/INT-3565

Cast to `IntegrationObjectSupport` fails if the handler is
already proxied in `AbstractSimpleMessageHandlerFactoryBean`.

Conflicts:
	spring-integration-core/src/main/java/org/springframework/integration/config/AbstractSimpleMessageHandlerFactoryBean.java

Resolved.

INT-3565 Polishing

- Fix test.
- enhance test to show that directly bound message handler beans are not advised if already proxied.
INT-3564 Update Javadoc URLs to spring.io

JIRA: https://jira.spring.io/browse/INT-3564