Add constrained generation cookbook

[aymeric-roucher]

What does this PR do?

Add a cookbook on constrained generation.

Who can review?

@MKhalusova

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[stevhliu]

Sweet recipe!

I think the structure can be improved a bit so its clearer what users are doing exactly in a specific section. You started with saying "This notebook demonstrates structured generation on two inference methods", so I think my expectation was for the notebook to be structured that way. The two topics, prompting and grammar, can be discussed within the larger context of these two sections.

# RAG with source highlighting using constrained generation
## Hugging Face Inference Endpoints
## Outlines

[aymeric-roucher]

Thank you! Since I think the distinction of prompting VS constrained generation is more interesting than HF vs Outlines, I prefer to emphasize in the intro the prompting VS constrained generation dichotomy, then only mention the use of Outlines as an extra.

[aymeric-roucher]

@stevhliu I changed the name of the notebook to "structured_generation" to represent a wider topic ("constrained generation" is only a method to achieve "structured generation"). Then its subparts are prompting (naive approach) and constrained generation (advanced approach).

[stevhliu]

Left a few more suggestions, but otherwise, I think this looks very good and can be merged once the comments are addressed!