Merging this PR will improve performance by 19.23%

⚡ 1 improved benchmark
✅ 69 untouched benchmarks
⏩ 129 skipped benchmarks¹

Performance Changes

_{Comparing G4brym:add-ai-search-rpc-types (6159082) with main (1ac33c5)}

Hey @petebacondarwin yes, all of theses [key: string]: unknown; for forward compability, in 2 different planes, inside the ai_search_options is because we keep adding new fields and settings all the times, and ideally we dont want to give ts type errors for users on older worker types versions
And on a different plane there is also chat completions format, that each model provider as different options, and since we forward most requests without changing the body, we also dont want to give users ts type errors for a field on a specific provider