Add ConvexProviderWithAuthKit for WorkOS AuthKit integration

[nicknisi]

Summary

• Add ConvexProviderWithAuthKit component for integrating Convex with WorkOS AuthKit
• Create new react-authkit package with proper build configuration
• Add @workos-inc/authkit-react as a dev dependency for testing

Changes

• src/react-authkit/ConvexProviderWithAuthKit.tsx: New provider component that wraps ConvexProviderWithAuth and adapts WorkOS's auth hook structure
• src/react-authkit/index.ts: Export the new component
• react-authkit/package.json: Package configuration for the new module
• api-extractor-configs/react-authkit-api-extractor.json: API extractor configuration for type definitions
• package.json: Added @workos-inc/authkit-react dev dependency

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