feat: add openai compatible response support for anthropic on azure

[arturfromtabnine]

Description: (required)
Without steam-chatComplete response transformer specified , stream response from anthropic model hosted on azure is native anthropic sse and not open ai compatible

curl --location 'http://localhost:8787/v1/chat/completions' \
--header 'x-portkey-provider: azure-ai' \
--header 'Authorization: $AZURE_API_KEY' \
--header 'x-portkey-azure-foundry-url: https://resource-name.services.ai.azure.com/anthropic' \
--header 'Content-Type: application/json' \
--data '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 10000,
    "messages": [
        {
            "role": "system",
            "content": "You are a helpful assistant."
        },
        {
            "role": "user",
            "content": "why sky is blue?"
        }
    ],
    "stream": true,
    "stream_options": {
        "include_usage": true
    },
    "anthropicBeta": "fine-grained-tool-streaming-2025-05-14"
}'

example of stream chunk before change

{
    "type": "content_block_delta",
    "index": 0,
    "delta": {
        "type": "text_delta",
        "text": " re"
    }
}

after the change

{
    "id": "azure-ai-1765363108622",
    "object": "chat.completion.chunk",
    "created": 1765363114,
    "model": "claude-sonnet-4-5-20250929",
    "provider": "anthropic",
    "choices": [
        {
            "delta": {
                "content": " re"
            },
            "index": 0,
            "logprobs": null,
            "finish_reason": null
        }
    ]
}

Tests Run/Test cases added: (required)

• Description of test case

Type of Change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)

[narengogi]

valid

[narengogi]

I've updated the PR to make this fully feature complete