Implement Soroban Transfer Dependency Resolver

[mijinummi]

🧠 Concept

Resolve dependencies between chained Soroban transfers.

⚠️ Problem

Dependent transfers may execute out of order.

📁 Implementation Scope

• src/dependencies/transfers/stellar/

✅ Requirements

• Track transfer dependencies
• Enforce execution ordering

🎯 Acceptance Criteria

• Dependency resolver implemented