Fix/Invalid VR.AddCommand sent during CreateInteractionChoiceSet resumption

[ShobhitAd]

Fixes #3888

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

ATF tests PR submitted for issue

Summary

Modified creation messages for AddCommand DeleteCommand requests
Added check of vr part in VRAddCommandRequest
Added check of grammar_id in VRDeleteCommandRequest
Added unit tests

CLA

• I have signed the CLA

[jacobkeeler]

Ah, another note is that we would need to skip the VR.DeleteCommand sending step in delete_interaction_choice_set_request.cc as part of this solution as well.

  if (choice_set.keyExists(strings::grammar_id) &&
      choice_set[strings::grammar_id].asInt() != -1) {
    SendVrDeleteCommand(app);
  } else {
    SendDeleteInteractionChoiceSetResponse();
  }

Those three changes on their own should solve the issue though