Contribute demo-hallucination.pdl to granite-snack-cookbook

[esnible]

Is your feature request related to a problem? Please describe.

• Contribute demo-hallucination.pdl to https://github.com/ibm-granite-community/granite-snack-cookbook/
• Contribute a Jupyter notebook explaining the demo.

Describe the solution you'd like

• demo-hallucination.pdl uses a hard-coded passage. Make an example more like the existing Granite examples.
• The notebooks should have a cell with %load_ext pdl.pdl_notebook_ext to load the PDL Jupyter extension.
• The PDL programs should follow a format like

%%pdl --reset-context
text: 
- "What is the meaning of life?\n"
- model: ollama/granite-code:8b

This issue is to write a PDL example with the functionality of https://github.com/ibm-granite-community/granite-snack-cookbook/blob/main/recipes/Intrinsics/Granite_RAG_LoRA.ipynb and contribute it as a community cookbook.

Additional context
Design discussion can be done under this Issue. When we are ready, we will create an Issue and PR in https://github.com/ibm-granite-community/granite-snack-cookbook/