INT-4361: Add a role() hook to Java DSL

JIRA: https://jira.spring.io/browse/INT-4361

* To get a gain of the method chain code flow and avoid extra annotation
parsing, add `.role(String)` hook to the `EndpointSpec`
* Delegate the provided `role` property to the `AbstractEndpoint`
* Register `AbstractEndpoint` as itself `SmartLifecycle` in the
`SmartLifecycleRoleController`
* Add `destroy()` to the `AbstractEndpoint` and remove it from the
`SmartLifecycleRoleController`
* Provide some Java 8 code style refactoring

* Rework XML parsers and Annotation processors to populate `role`
property on the `AbstractEndpoint`
* Wrap `roleController` bean extraction to the `NoSuchBeanDefinitionException` catch
* Fix several `AbstractEndpoint` implementation to properly call
`super.onInit()` which has been missed before

src/reference/asciidoc/endpoint.adoc

@@ -653,6 +653,12 @@ private SmartLifecycleRoleController roleController;
 ...
 ----
 
+[source, java]
+----
+IntegrationFlow flow -> flow
+        .handle(..., e -> e.role("cluster"));
+----
+
 Each of these adds the endpoint to the role `cluster`.
 
 Invoking `roleController.startLifecyclesInRole("cluster")` (and the corresponding `stop...` method) will start/stop