Enhance NFT Collection Manager contract with new features, security, and refactoring

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Summary:

This pull request introduces a new NFT Collection Manager Contract that allows for the creation, management, and transfer of digital art NFTs. The contract includes the following key features:

• Enhanced Storage Structure:

  • Includes detailed storage for each art piece (title, creator, size, description, tags).
  • Tracks user access rights to each art piece.

• Error Handling:

  • Introduces specific error codes for different failure scenarios (e.g., art not found, invalid title/size, unauthorized access, etc.).

• Helper Functions:

  • Functions to validate art details such as title, size, tags, and access rights.
  • Helper functions for ownership checks and managing art creation times.

• Public Functions:

  • create-art: Allows creation of new art pieces with proper validations.
  • transfer-ownership: Enables creators to transfer ownership.
  • update-art: Facilitates updates to existing art details.
  • get-art-details, get-art-description, and more to fetch and interact with art pieces.

Add meaningful new Clarity contract functionality:

Several new functions (such as create-art, get-art-description, check-user-access, etc.) have been added, adding meaningful functionality related to managing art pieces, ownership, access control, and metadata validation.

Enhance the security of your contract:

The introduction of error codes like ERR-UNAUTHORIZED-ACCESS and ERR-NO-ACCESS-PERMISSION, along with the check-user-access and has-access? functions, enhance the security of the contract by ensuring proper access control.

Meaningful refactor that enhances functionality or performance:

The enhancement of the storage structure and the introduction of new functions like increment-art-counter and art-exists? indicate meaningful refactoring that improves contract functionality, particularly in managing art piece metadata and access control.

Why This Change Is Needed:

This contract aims to provide a robust and secure way to manage a collection of NFTs, ensuring only authorized users can make modifications while enabling flexible features like ownership transfer and tag validation.

Testing:

• Thorough testing of all functions, especially access control and ownership-related functions, is recommended.