Support for Ollama LLM Client

[bhaskarblur]

We should add integration for the Ollama LLM client as one of the supported language models in NeoBase.

Why?

• Ollama offers a local, fast, and privacy-first way to run large language models. Adding support for it will:
• Enable users to run NeoBase queries without needing external API keys.
• Support offline and secure environments.
• Offer faster iteration for local development and testing.

Expected Features:

• Allows users to configure and select Ollama as the LLM backend in NeoBase backend.
• Users can use their custom trained or hosted Ollama LLMs in NeoBase.