Add support for OpenAI and Azure OpenAI models

[crabhit]

Add functionality to integrate OpenAI models, including compatibility with Azure OpenAI endpoints. This will enable users to utilize a broader set of AI models for their workflows.\n\nRequirements:\n- Support various OpenAI models via API integration.\n- Add configuration options for Azure OpenAI endpoints.\n- Document configuration steps and usage examples.\n- Ensure compatibility with existing features.\n\nPotential Work:\n- Refactor current model integration logic to allow pluggable providers.\n- Add authentication and endpoint selection for Azure OpenAI.\n- Provide tests for the new integration.\n\nLabel: enhancement