Implement AI-driven metadata generation for sample packs

Commit notes

- Added a new API endpoint to generate title, description, and tags for sample packs using AI, enhancing user experience by providing automated suggestions. - Integrated the GeneratePackMetadata function in the AIGenerationHandler to handle requests and return generated metadata. - Updated the frontend PackManager and related components to include a button for generating AI suggestions, allowing users to easily enhance their pack information. - Introduced new types for AIMetadataSuggestion to improve TypeScript support and ensure type safety across the application.