Update openai tracing for responses api

[viniciusdsmello]

# Pull Request

## Summary

This PR adds comprehensive tracing support for OpenAI's new Responses API (`client.responses.create`) while maintaining full backward compatibility with the existing Chat Completions API (`client.chat.completions.create`).

## Changes

- [x] Updated `trace_openai` and `trace_async_openai` to dynamically detect and patch the `responses.create` endpoint.
- [x] Implemented new handler functions for both streaming and non-streaming Responses API calls (sync and async).
- [x] Added helper functions for Responses API-specific parameter mapping, output parsing, streaming chunk extraction, and usage data extraction.
- [x] Modified `add_to_trace` to differentiate between Chat Completions and Responses API calls for improved trace naming and metadata.
- [x] Created a comprehensive example (`examples/tracing/openai/responses_api_example.py`) demonstrating usage for both APIs, including streaming and function calling.

## Context

OpenAI's Responses API unifies multiple capabilities (chat, text, tool use, JSON mode) into a single interface, providing improved metadata structure and traceability. This update extends Openlayer's tracing logic to support this new, more aligned endpoint, ensuring that users can leverage the latest OpenAI features with full observability without breaking existing integrations.

## Testing

- [x] Unit tests (comprehensive test suites verifying backward compatibility and new Responses API features for both sync and async clients)
- [x] Manual testing (verified functionality using the new example script)
- [ ] Postman CI/CD
- [ ] Other (please specify)

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