Llmshade: adding a code that won a LLM-based competition for creating bbo optimizers into Nevergrad

[teytaud]

Types of changes

Essentially, adding LLMshade.
Incidentally, solving a rare issue in metamodels.

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Motivation and Context / Related issue

How Has This Been Tested (if it applies)

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document and completed the CLA (see CLA).
• All tests passed, and additional code has been covered with new tests.

[meta-cla]

Hi @teytaud!

Thank you for your pull request.

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You currently have a record in our system, but the CLA is no longer valid, and will need to be resubmitted.

Process

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