Add Support for Multiple Model Integrations

[AdonaiVera]

This PR introduces the integration of multiple LLMs to enhance flexibility and adaptability:

• Anthropic: Fully integrated and works seamlessly for generation. However, it currently lacks an embedding algorithm. To address this, OpenAI embeddings are being used as a workaround.
• GPT4All: Integrated and running successfully locally. While it's slower compared to cloud-based models, it offers great flexibility for devices with varying computational power.

Future Improvements:

• Plan to add support for Hugging Face embeddings to improve versatility and reduce reliance on specific APIs.

Key Features:

• Multi-model support for generation and embeddings.
• Adaptable to different computational capacities.
• Clear structure for integrating new model options in the future.

Let me know your feedback, suggestions, or any potential improvements! 🚀