feat: remain original response body

[4t145]

Remain original response body, so users can do provider specific operations.

[jeremychone]

@4t145 So, this is a good advanced feature to have.

Now, for the implementation, we would need a few things.

1. It should not be enabled by default, and should be behind ClientConfig, probably .capture_raw_body.
2. In the ChatResponse, it will be capture_raw_body: Option<serde_json::Value>.
3. The body clone should happen first, before the "remove" happens.

So, we have two options.

a) Close this PR and create a new one with just one commit. I really need to see all of the changes in one commit so I don't have to merge everything in my head.

b) I merge this PR, and then make the change myself in another commit.

let me know how you want to proceed.

[jeremychone]

@4t145 so, you want the option b) or a) ?

[4t145]

I can merge all the commits into one, but if you are willing to implement those yourself, you can just merge this and modify it your self. Otherwise I will handle this tomorrow. Thanks for your work!

[4t145]

@jeremychone Now you can review again.

[jeremychone]

@4t145 Cool, will look at it tomorrow or Friday.

[jeremychone]

@4t145 Ok, overall looks good. One thing, is that you added "client" to the to_chat_response to get th options, but we alreayd have the option_sets.

I will merge this PR and fix it.

Also, the property to get the content should be captured_raw_body.

But otherwise, pretty good. I like the way you did let capture_raw_body = client.config().capture_raw_body().then(|| body.clone());

[jeremychone]

I understand the confusion. You put it in ClientConfig, which is understandable. But we want this at the Chat Options level so hat we can override it per chat.

[jeremychone]

@4t145 Done. So, now you set it at the ChatOptions level. Which can be set at the client level, or when making a request (and it will override)