Add OpenAI & Claude services

[adityaghai07]

Add OpenAI and Claude Integration

Description:
Add integrations for OpenAI and Claude to the Rag project alongside the existing Gemini integration.

Objectives:

• Integrate OpenAI (GPT-3.5/4) for tasks like text generation and Q&A.
• Integrate Claude for Q&A and text generation.

Requirements:

• API integration for both OpenAI and Claude.
• Error handling and fallback mechanisms.

Note

• Right now only add the functions as present in get_gemini_response.py like get_openai_response and get_claude_response