feat: Support DS as a return type for program calls

[abmusse]

Is your feature request related to a problem? Please describe.

Yes original issue was #74

Hey there,
I'm still looking for a solution to this issue, or for some help or documentation.
I know, this issue has now been automatically closed. Maybe someone can have a new look on it anyway?

Originally posted by @patrickhrastnik in #74 (comment)

From what I can tell, this is not currently supported. addReturn always uses a <data> element, not a <ds>: https://github.com/IBM/nodejs-itoolkit/blob/master/lib/ProgramCall.js#L107

That is correct looks like it only expects a simple data type.

According to xml service docs

return tag does support returning a DS.

      * ---
      * pgm return
      * <return>values (see <ds> and <data>)</return>
      * ---
      * return      - return tag
      *  values     - (see ds or data)
      * options
      *  na         - no options
      *
      * ---

Add return should be able to return DS though.

We should have feature request issue for this.

Originally posted by @abmusse in #74 (comment)

Describe the solution you'd like

Support DS as a return type for program calls