create openAi adapter

[babasha]

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[gemini-code-assist[bot]]

Summary of Changes

Hello @babasha, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly extends the Google ADK-Go framework by integrating an OpenAI-compatible adapter. This enhancement allows developers to build AI agents that can seamlessly utilize a wide range of Large Language Models, from local setups like LM Studio and Ollama to the official OpenAI API. The adapter supports advanced agent capabilities such as multi-turn conversations with tool use, real-time streaming, and robust error handling, making ADK-Go more versatile and accessible for modern AI applications.

Highlights

• OpenAI Adapter Integration: Introduces a new OpenAI-compatible adapter for the Google ADK-Go framework, enabling interaction with OpenAI API, LM Studio, Ollama, and other compatible endpoints.
• Multi-turn Tool Calling: Implements full conversation flow with tool execution and conversation history management, including session TTL cleanup.
• Streaming Responses: Adds support for Server-Sent Events (SSE) for real-time output from LLMs.
• Robust Error Handling: Incorporates exponential backoff, rate limiting, and retry logic for API calls, along with JSON argument sanitization and iteration guards to prevent infinite loops.
• Comprehensive Example: Provides a weather_agent example demonstrating the adapter's usage with a mock tool, configurable for various LLM providers.
• Repository Setup Guidance: Includes detailed instructions for GitHub repository configuration, such as description, topics, and release notes for an initial v0.1.0 release.

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[babasha]

Fixed / Addressed in latest commit