Stunner - first POC of new marshallers

Create a Java console application which generates XML which can be imported to VS Code plugin and executed on Kogito Runtime.

Acceptance Criteria

New Console app will use Java Classes to generate simple process, which can be imported into VS Code BPMN plugin and executed on Kogito runtime.
Generated process should be:
Start->Script Task->End

Script Task should have script: System.out.println("Hello world");

It should demonstrate that it is possible to import processes from different BPMN Editors: Kogito VS Code plugin, bpmn.io online, Trisotech