INT-2856:Add support for adding/removing individual recipients to the Re...

Add support for adding/removing individual recipients to the RecipientListRouter
In my opinion the logic should be not `getBeanName()` and compare `channeld`s, but get the channel from `BeanFactory` and compare objects.
For example `FixedSubscriberChannel` doesn't extend `IntegrationObjectSupport`. The same for valid channels from `spring-messaging`.