feat: Add POAP (Proof of Attendance Protocol) System

[JJOptimist]

This PR implements a POAP (Proof of Attendance Protocol) system for tracking event attendance and participation in Gno.

Tasks

Core Implementation:

• Set up basic POAP structure
• Initialize GRC721 integration
• Implement POAP creation
• Add minting functionality
• Create storage functions
• Add ownership management

Testing:

• Add initial structure test
• Add creation tests
• Add minting tests
• Add storage tests

UI/Render:

• Implement POAP listing page
• Add user collection view
• Create minting interface

Current Implementation

• Basic POAP structure using GRC721
• AVL tree for POAP storage
• Initial test setup

[Gno2D2]

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