Fix: [CONTRACT] Implement Common Types Module

[Georgechisom]

The fix implements a comprehensive shared types system for the AssetsUp contracts, providing consistent and reusable enums across all contract modules with proper Soroban serialization support.

Features Added

New Shared Enums

• AssetType - Distinguishes between Physical and Digital assets
• AssetStatus - Tracks asset lifecycle (Active, InMaintenance, Disposed)
• ActionType - Audit trail actions (Procured, Transferred, Maintained, Disposed, CheckedIn, CheckedOut)
• PlanType - Subscription tiers (Basic, Pro, Enterprise)
• SubscriptionStatus - Subscription states (Active, Expired, Cancelled)

Technical Implementation

• All enums use #[contracttype] for Soroban serialization
• Proper #[derive(Clone, Debug, Eq, PartialEq)] traits
• Comprehensive documentation with /// comments
• Public exports via pub use types::* in lib.rs
• Full test coverage for all enum variants and functionality

Breaking Changes

• Updated AssetType from specific variants (IT, Furniture) to generic (Physical, Digital)
• Existing tests updated to use new enum variants

Testing

• Added comprehensive unit tests for all enum types
• Verified enum equality, cloning, and function parameter usage
• All existing tests updated and passing
• Zero compiler warnings or clippy issues

Files Modified

• src/types.rs - Enhanced with all required enums and documentation
• src/lib.rs - Added public re-export of types
• src/tests/types.rs - Comprehensive test coverage
• src/tests/mod.rs - Added types test module
• src/tests/asset.rs - Updated for new AssetType variants

Verification

• cargo build - Clean compilation
• cargo test - All tests passing (10/10)
• cargo clippy - No linting issues
• Types accessible across contract modules
• Soroban serialization compatibility verified

Benefits

• Consistency: Shared types ensure uniform data structures across contracts
• Type Safety: Strong typing prevents runtime errors
• Maintainability: Centralized type definitions reduce duplication
• Extensibility: Easy to add new variants as requirements evolve
• Documentation: Well-documented enums improve developer experience

Closes #244

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