Add extended functionality for Coming Soon features

[Dishant27]

Overview

This PR implements all the "Coming Soon" features mentioned in the README:

• Dataset Operations: List, download, create, and get metadata for datasets
• Notebook Integration: List, pull, push, and analyze notebooks
• User Management: View user profiles and information
• Competition Analysis: Analyze competition data, view leaderboards, get competition details

Key Changes

• Restructured the codebase into a modular organization with separate modules for each feature domain
• Created a core module with shared utilities
• Implemented comprehensive Kaggle API wrappers
• Added detailed documentation for new features
• Updated README with example queries for all new features

How to Test

1. Build the project with npm run build
2. Start the server with npm start
3. Connect to Claude and try the new queries listed in the README

Benefits

This modular structure makes it easier to:

1. Add new features in the future
2. Maintain existing functionality
3. Debug and test individual components
4. Understand the codebase for new contributors