LlamaIndex OpenAI Agent

The `llama-index-agent-openai` library provides an integration for creating agents within LlamaIndex that leverage OpenAI's language models. It allows defining tools and orchestrating them with OpenAI's function-calling capabilities, making it easy to build powerful LLM-powered applications. As part of the LlamaIndex ecosystem, it stays current with LlamaIndex's modular architecture (v0.10+). The current version is `0.4.12`, with updates typically aligning with LlamaIndex core releases.