Update Zero Shot Prompting output formatting to match desired format

[dendroenydris]

format sample: zero_shot_prompting.json { "id": "", "question": "", "answer": "", "results": { "model": "", "plain_triples_results": {"response": "", "context": "", "metrics": {"exact_score": "", "meteor": ""}}, "verbalizer_results": {}, "evidence_matching": {}, "verbalizer_plus_evidence_matching": {} } }