fix(responses): support raw responses for parse()

[ShreehariVaasishta]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

This PR adds the missing parse method to both ResponsesWithRawResponse and AsyncResponsesWithRawResponse in responses.py.

Currently, attempting to call client.responses.with_raw_response.parse() raises an AttributeError because the method isn't included in the wrapped client.

Additional context & links

This change makes it possible to use with_raw_response.parse().
Related error for context:

response = client.responses.with_raw_response.parse( model="gpt-4.1", input=[ {"role": "system", "content": "Extract the event information."}, { "role": "user", "content": "Alice and Bob are going to a science fair on Friday.", }, ], text_format=CalendarEvent, )

AttributeError: 'ResponsesWithRawResponse' object has no attribute 'parse' 

[ShreehariVaasishta]

@RobertCraigie When you have a chance, could you please take a look at this PR?
happy to address any feedback or questions you might have.

[RobertCraigie]

Thanks!