feat(scan): Complete and reorganize quality scan

[pierlj]

Description

• Reorganize the quality scenario generators under a dedicated subpackage
• Add 3 new generators: out of scope, multi topic, and split questions
• Add component tags, to match features from RAGET

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

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Checklist

• I've read the CODE_OF_CONDUCT.md document.
• I've read the CONTRIBUTING.md guide.
• I've written tests for all new methods and classes that I created.
• I've written the docstring in NumPy format for all the methods and classes that I created or modified.
• I've updated the uv.lock running uv lock (only applicable when pyproject.toml has been
  modified)

[gemini-code-assist]

Code Review

This pull request introduces a new Contradiction check and refactors the KnowledgeBaseScenarioGenerator into several specialized quality scenario generators, including HallucinationScenarioGenerator, MultiTopicScenarioGenerator, OutOfScopeScenarioGenerator, SplitQuestionsScenarioGenerator, and SycophancyScenarioGenerator. It also updates the groundedness prompt to allow explicit refusals and adds a helper method to retrieve closest documents to arbitrary text. The review feedback suggests improving the _stringify method in the contradiction judge to format lists cleanly, executing document retrieval concurrently using asyncio.gather in the multi-topic generator, and validating against empty or whitespace-only queries in the knowledge base utility.

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[gemini-code-assist]

The closest documents for each turn are currently retrieved sequentially using a list comprehension with await. Since these are independent async calls, they can be executed concurrently using asyncio.gather to improve performance, especially when there are multiple turns.

            import asyncio
            closest_docs_list = await asyncio.gather(*(
                params.knowledge_base.closest_documents(
                    turn_seed_index, self.context_documents
                )
                for turn_seed_index in turn_seed_indices
            ))
            turn_contexts = [
                [doc.content for doc in docs]
                for docs in closest_docs_list
            ]

[kevinmessiaen]

Might be worth to allow a clean setup of all the DEFAULT_* used in scan.

Maybe using pydantic-settings to allow setting env variables to override GISKARD_SCAN_*?

We can keep it like this and work on this in a separate issue

[pierlj]

That's a good point, I would keep it in a separate PR.