[0.2.0v][Feature]: Add LLM configuration to YAML

[Kavirubc]

Problem Statement

Currently Gemini-2.0-flash is used as the default model and can not be changed using the YAML. Developer should be able to configure this. Should also look at other Providers.

Proposed Solution

Problem itself explains the solution.

Alternatives Considered

No response

Feature Scope

Configuration

Additional Context

No response

Contribution

• I would be willing to help implement this feature