JIRA: https://jira.spring.io/browse/INT-4157
- Refactor the core message-driven endpoint to be `MessageProducerSupport`, eliminating the DSL wrapper
- Retain and refactor the DSL gateway wrapper - still required because it needs to be a MGS
- Port the (core) `Channels` factory
Fix Javadoc
Remove Deprecated setter
Move JmsInboundGateway to the jms Package
* Some polishing for `@Copyright`s
* Remove `@Deprecated` methods in the `Jms`
* Reinstate `IntegrationFlows.from(Function<Channels, MessageChannelSpec<?, ?>>)`
* Typos fixes in the `JmsTests`
cfceca8518