formatting json file with benchmark results

[psydok]

Is your feature request related to a problem? Please describe.
It is not convenient to view a json file with benchmark results. Everything is in 1 line, you have to install additional extensions to parse or resave the file.

Describe the solution you'd like
Formatting when saving a json file.

Describe alternatives you've considered
installing prettifyjson or resaving the file.
I would also suggest considering the option of splitting files: with prompta and model responses and with metrics, as llmperf does.

Additional context

def save_json(data, file_to_save):
    with open(file_to_save, 'w', encoding='utf-8') as file:
        json.dump(data, file, ensure_ascii=False, indent=4)

[markurtz]

Fixed by #372