Include `type_to_response_format_param` in public API

[s-banach]

Confirm this is a feature request for the Python library and not the underlying OpenAI API.

• This is a feature request for the Python library

Describe the feature or improvement you're requesting

Now I have to do the following:
from openai.lib._parsing._completions import type_to_response_format_param

Please expose this publicly. You have to maintain it anyway, for the ChatCompletions.parse function.

Additional context

No response