Fixes https://github.com/spring-projects/spring-integration/issues/3804
Instead of manual SMB server setup and preparation, make it all
automated using convenient Testcontainers library and a bit of extra
code executed before tests.
* Change `localhost` to `127.0.0.1` for a proper integration with docker container
* A few new config values to support container environment, like tmpFs,
share permissions and a dynamic port value
* Introduce Testcontainers API for container management
* Few configuration changes to support docker container usage
* Automatic dirs and files layout creation in `@BeforeAll`
* A few bugfixes where the assertion has not been done actually
* Couple of small changes related to assertions readability as well
* Use `warn` as default logging level for the SMB tests
* Refactor an `SmbTests` a bit: moving its `createFilesInSmbShare()` to
the `SmbTestSupport` since that files tree can be useful for any other
similar integration tests in the future
* Use `TestUtils.applySystemFileSeparator()` for cross-platform file paths
Fixes https://github.com/spring-projects/spring-integration/issues/3623
* `IntegrationFlow` refactoring
* Apply several code style improvements and good practices
* Code style: no empty lines for methods javadocs
* make deprecated implementation reuse actual one instead of the copy-paste approach
* add whats-new comments
* Fix whats-new page according to standards
* Add namespace handler support for new XSD configs
* Add JUnit tests for outbound gateway XML config
* Add JUnit tests for streaming inbound adapter XML config
* Add Javadoc to new parser classes as per PR feedback
* Some code clean up
* Improve permission information returned in `SmbFileInfo`
* Improve documentation for `SmbFileInfo.getPermissions()`
* Add Junit tests to verify all outbound gateway functionality
* Clean test directory of mistakenly migrated SMB extension code
* Added supporting classes for DSL, fixed checkstyle build errors
* Added JUnit tests for DSL package
* Updated Java Doc with instructions to setup an external SMB share
* Updated AsciiDoc to include instructions on Java DSL configurations
* Updated implementation based on PR review feedback
* Clean up the code
* Add more info to `whats-new.adoc` for these SMB changes
* Updated, polished documentation prior to PR review
* Updated after PR review comments, changed Adapter verbiage to Support
* Add `SmbMessageHandler(SmbRemoteFileTemplate)` ctors
* Clean up `smb.adoc` for extra redundant interim headlines
* Removed deprecated replaceFile and useTempFile session configs
* Refactored to use AssertJ instead of JUnit asserts as per PR feedback
* Code clean up for SMB module
