chore(examples): add basic RAG workflow configuration

[StanGirard]

• Added a new file basic_rag_workflow.yaml to the examples/chatbot directory.
• Configured a standard RAG workflow with multiple nodes and edges.
• Set the maximum number of previous conversation iterations to include in the answer context.
• Added configuration for the LLM (Language Model) with maximum output tokens and temperature.

Description

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Checklist before requesting a review

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• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented hard-to-understand areas
• I have ideally added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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