CONTRACTS: Implement Token Metadata System

[truthixify]

Description
Add metadata support to membership tokens including custom attributes, descriptions, and extensible properties for enhanced token functionality.

Files to Modify

• contracts/manage_hub/src/membership_token.rs - Add metadata functionality
• contracts/manage_hub/src/types.rs - Add metadata structures
• contracts/common_types/src/types.rs - Add metadata types and validation
• contracts/manage_hub/src/lib.rs - Add metadata endpoints

Key Changes Required

• Metadata Structures - Create flexible metadata structures supporting various data types
• Metadata Management - Add functions to set, update, and retrieve token metadata
• Validation System - Implement metadata validation rules and size limits
• Query Functions - Add functions to search and filter tokens by metadata
• Extensible Attributes - Support custom attributes and properties for different use cases
• Metadata Transfer - Ensure metadata is properly handled during token transfers

Acceptance Criteria

• Add metadata structure to token definition with flexible attributes
• Implement set_token_metadata and get_token_metadata functions
• Add metadata validation and size limits (prevent abuse)
• Create metadata query functions with filtering capabilities
• Support for custom attributes and extensible properties
• Include metadata in token transfers and operations
• Add metadata versioning and update history
• Implement metadata-based token search and filtering

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[ryzen-xp]

@ryzen-xp has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi maintainers 👋
I’m a blockchain developer with strong expertise in Stellar, Rust,TS and Stellar SDK integrations. I’ve worked on multiple Stellar-based smart contract and backend systems.

I understand the scope of this issue and can deliver a reliable, production-quality solution with proper tests and documentation.
Plz assign me !!

ETA: 24 hours

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[AbdulSnk]

@AbdulSnk has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

hello maintainer, i would like to work on this issue. i have worked on relevent tasks and issues like this.

Kindly let me work on this

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