Add HttpxOCIAuth Integration Documentation for HTTPX Clients

[mrDzurb]

Overview

This PR updates the documentation to include a new section for the HttpxOCIAuth class.
The HttpxOCIAuth class enables HTTPX clients to sign requests using OCI signers, making them compatible
with OCI Model Deployment services and LLM models. This integration facilitates the use of OCI authentication
with HTTPX-based clients and extends compatibility to third-party libraries such as the OpenAi client.

Changes

• Added a new documentation section titled HTTPX Client Integration with OCI Authentication (HttpxOCIAuth)
• Included code examples for both synchronous and asynchronous HTTPX client usage
• Enhanced the ads.set_auth() with default client_kwargs = {"service_endpoint": OCI_ODSC_SERVICE_ENDPOINT}

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[mayoor]

Keyword arguments supported by httpx.Client.

[mrDzurb]

done

[mayoor]

Creates and returns a synchronous httpx Client configured with OCI authentication signer based the authentication type setup using ads.set_auth method or env variable OCI_IAM_TYPE. More information - https://accelerated-data-science.readthedocs.io/en/stable/user_guide/cli/authentication.html

[mrDzurb]

done

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[qiuosier]

I think OCI_ODSC_SERVICE_ENDPOINT can only be used by DataScienceClient. Similarly, different client will have different service endpoint (if the users choose to set it). However, seems like this PR is setting the same service endpoint for all clients, which may cause errors. There will be no errors unit tests as it is not actually connected to the endpoint.

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