Implements suggestion discussed in issue #6049 by adding raw_response field to CreateResult.

[tongyu0924]

Why are these changes needed?

This PR adds a new raw_response field to the CreateResult class to store the original response object returned by the model.

Related issue number

Closes #6049

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[ekzhu]

The uv.lock file shouldn't be changed.

[ekzhu]

We don't want to delete this file. I meant we should keep this file unchanged.

[tongyu0924]

We don't want to delete this file. I meant we should keep this file unchanged.

I’ve reverted uv.lock to match main exactly.
Could you please confirm that everything looks correct? Thanks!

[ekzhu]

Can you resolve the conflict with the main branch? So we can make sure there is no changes to uv.lock in this PR.

[tongyu0924]

Can you resolve the conflict with the main branch? So we can make sure there is no changes to uv.lock in this PR.

Hi @ekzhu,
I have resolved the conflict with the main branch and confirmed no changes to the uv.lock file in this PR. Feel free to review the updated changes.

Thanks!

[ekzhu]

A number of test cases and auto checks are failing. Please follow python/README.md