* Add support for Kotlin JSR223 scripts
* Add required Kotlin dependencies into the `spring-integration-scripting`
module
* Introduce `KotlinScriptExecutor` to interact with the
`KotlinJsr223JvmLocalScriptEngineFactory` directly since there is no
`META-INF/services/javax.script.ScriptEngineFactory` file in the Kotlin
* Also set an `idea.use.native.fs.for.win` system property to `false` in
this class to disable check for native support on Windows.
(Might be removed in future Kotlin versions)
* Move `ScriptParser.getLanguageFromFileExtension()` logic into the
`ScriptExecutorFactory.deriveLanguageFromFileExtension()` since the same
one must be applied in the `DslScriptExecutingMessageProcessor`, too.
* Modify tests to reflect Kotlin support
* Fix some test scripts to their official extensions
* * Add JavaDocs
* Polishing according Sonar objections
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