added user ability to add new tasks

[ranuru]

This pull request adds the ability for users to create new schema challenges through the frontend and backend. The main changes include a new "Create Challenge" page in the frontend, updates to the backend API to support challenge creation, and security adjustments to require authentication for challenge creation.

Frontend: New Challenge Creation UI

• Added a new page component, CreateChallengePage, which provides a form for users to input challenge details, schemas, test cases, and code templates. The form supports adding/removing multiple schemas and test cases, and submits the data to the backend.
• Updated routing in App.jsx to include the new /challenges/new route and render CreateChallengePage for it. [1] [2]
• Added a "+ New Challenge" button to the challenge list page header, linking to the new challenge creation form.

Backend: Challenge Creation API

• Added a new POST endpoint /api/challenges in ChallengeController to accept challenge creation requests, parse schemas and test cases, and persist the new challenge in the database. [1] [2]

Security: API Access Control

• Updated security configuration to require authentication for POST requests to /api/challenges, while still allowing unauthenticated GET requests. [1] [2]

Development Environment

• Updated VSCode settings to make Java build configuration updates interactive, improving the developer experience.