Added support for Ollama

[bharti26]

Pull Request

Description

Introduced Ollama configuration and selection via llm.provider = "ollama".
Added get_ollama_config() with defaults for local setups.
Ensured generation settings integrate seamlessly when using Ollama.
Fixes # (issue)

Type of change

Please non-releavant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change
• Documentation update

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