Description
Add functionality to burn (permanently destroy) tokens with proper authorization checks and event emission for tracking burned tokens.

Files to Modify

• contracts/manage_hub/src/membership_token.rs - Add burn functionality
• contracts/manage_hub/src/lib.rs - Add burn endpoint
• contracts/manage_hub/src/events.rs - Add burn event
• contracts/manage_hub/src/types.rs - Add burn authorization types

Key Changes Required

• Burn Function - Implement token burning with ownership verification
• Authorization - Add role-based permissions for burning tokens
• Event Emission - Emit events when tokens are burned
• Supply Tracking - Update total supply counters after burning
• Burn History - Maintain record of burned tokens
• Batch Burning - Support burning multiple tokens in one transaction

Acceptance Criteria

• Implement burn_token function with proper authorization
• Add BurnToken event with token ID and burner address
• Update total supply after burning
• Prevent burning of non-existent tokens
• Add batch_burn function for multiple tokens
• Include burn reason/metadata in events
• Add query function to retrieve burn history
• Implement burn restrictions based on token state