chore: add optional deps to giskard-scan

[henchaves]

Description

This PR makes it possible to install giskard-scan along with giskard-agents[provider].

Example:

pip install "giskard-scan[openai]"

pip install "giskard-scan[litellm]"

pip install "giskard-scan[all]"

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

[gemini-code-assist]

Code Review

This pull request introduces optional dependencies to the giskard-scan package in pyproject.toml (specifically for openai, google, anthropic, litellm, and all), mapping them to corresponding extras in giskard-agents. The uv.lock file has been updated accordingly to reflect these changes. There are no review comments, and the changes look correct and well-structured.

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