Property 'autoStoreVariables' used by Script task is missing in Flowable Modeler In CMMN model

Flowable CMMN documentation documents autoStoreVariables attbibute for the Script task, but it is missing from modeler. Not only in UI but in back end REST endpoint code too.

NB: This exactly same issue was reported and now fixed in BPMN model, but it has **not** been fixed in **CMMN model**.

**Expected behavior**
I expect modeler UI and backend to recognize and process the documented 'autoStoreVariables' in CMMN model. I worry that this is missing in engine side too.

**Additional context**
Flowable 6.7.2 , latest at the time of writing this.

Similar issue in BPMN model has been resolved in #1289 and #1296

Comienza comparando la CMMN modeler UI, el manejo REST del backend y el soporte del engine con las correcciones relacionadas de BPMN en los issues #1289 y #1296. Rastrea cómo se representa y procesa el atributo autoStoreVariables documentado en cada capa; la tarea estará completada cuando los modelos CMMN lo reconozcan y lo conserven a través de la UI, el REST endpoint y el engine.

Escrito por el modelo de indexación a partir del texto del issue.