Fixes https://github.com/spring-projects/spring-integration-samples/issues/340
The `LoggingHandler` uses a `org.springframework.integration.handler` category by default.
So, the `info` provided for the `loggingChannelAdapter` service activator does not
have any effects because `logback.xml` has an `ERROR` for the
`org.springframework.integration` category
* Use dedicated `wsLog` category in the `LoggingHandler` bean definition
to print a server message published to the subscribed web socket clients
Turns out the CORS is always enabled for WebSocket with SockJS.
So, since we cannot predict an URL for the `index.html` therefore we always recommend open it on the same host port as server application - `http://localhost:8080`
* Remove usage of removed `org.springframework.util.SocketUtils`
in favor of OS-selected port
* Migrate mail tests to Greenmail instead of already obsolete (and soon to be removed)
`org.springframework.integration.test.mail.TestMailServer`
* Upgrade to the latest dependencies
* Migrate samples to `jakarta` namespace
* Rework `cafe-scripted` to RSocket instead of already removed RMI
* Migrate JMS samples to Apache Artemis for Jakarta EE 9
* Disables mails tests since there is a requirement to migrate to Greenmail for Jakarta EE 9 support
* Rework `generatePom` task to a new `maven-publish` plugin style
* Use `MatcherAssert.assertThat()`
instead of deprecated `Assert.assertThat()`
* Use `IntegrationFlows.fromSupplier(Supplier)`
instead of removed `IntegrationFlows.from(Supplier)`
* Use `org.springframework.integration:spring-integration-test`
throughout the project for more testing utilities
