fix(client): support response URL for Azure

[mssfang]

• Azure URL always include the openai path segment, but not all API endpoints use the deployments name. Therefore, the openai path segment should always be added when the URL is an Azure URL, but the deployments path segment should be optional.

• The /response Azure API doesn't use deployments (or model name) in the path segment.

• Added a new Azure Service version to AzureOpenAIServiceVersion enum. The /response endpoint requires version 2025-03-01-preview or above. Users should manually assign the service version when making requests to /response as Azure /response is not GA yet.

   OpenAIClient client = OpenAIOkHttpClient.builder()
            .azureServiceVersion(AzureOpenAIServiceVersion.latestPreviewVersion())
            // Gets the API key from the `AZURE_OPENAI_KEY` environment variable
            .baseUrl(System.getenv("AZURE_OPENAI_ENDPOINT"))
            // Set the Azure Entra ID
            .credential(BearerTokenCredential.create(AuthenticationUtil.getBearerTokenSupplier(
                new DefaultAzureCredentialBuilder().build(), "https://cognitiveservices.azure.com/.default")))
            .build();

• Bugfix: The changes in the ClientOptions ensure that the assigned AzureOpenAIServiceVersion value is copied to the new instance of the ClientOptions.

fixes: #371

[TomerAberbach]

This makes sense

Let me know once you've confirmed it's correct!

[mssfang]

@TomerAberbach can you have a look at this PR when you have time. It is all good now