Bharat Ramanathan

chore: initial commit with cohere RAG implementation

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This PR contains the course work and related code for the RAG-IRL course.

core: ensure `run_inline` is honored in AsyncCallback Handler

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The `AsyncCallBancManager` that handles callbacks doesn't honor a callback handler's `run_inline` attribute. This always executes tasks concurrently, which might not be suitable for all scenarios, especially when tasks are interdependent...