* INT-4458: Do not expose recursive generics API
JIRA: https://jira.spring.io/browse/INT-4458
According Kotlin generics system restrictions we can't expose API
based on the recursive generics, like we have with Java DSL for JMS
* Replace explicit recursive generics on factory method with the wildcard (`?`).
This way both Kotlin and Java are able to instantiate target object and perform
the proper chain API auto-completion
* Fix `JmsInboundChannelAdapterSpec` to deal with provided `S` type for the
`configureListenerContainer()` - the way we can configure a `JmsDefaultListenerContainerSpec`
* Add `kotlin-spring` Gradle plugin to avoid extra `open` modificator on `@Bean` methods
* Add `JmsDslKotlinTests.kt`
**Cherry-pick to 5.0.x excluding Kotlin support**
* Fix `Amqp` DSL factory for recursive generics
* Polishing for Kotlin tests
a62832c707