feat(secure): add SecureTokenHold functionality

[gustavovalverde]

Add SecureTokenHold Functionality for Token-Based Pre-Authorization

Summary

This PR implements SecureTokenHold functionality in PyAzul, enabling pre-authorization (hold) transactions using saved payment tokens with full 3D Secure authentication support.

🚀 New Feature: SecureTokenHold

Core Implementation

• SecureTokenHold model in pyazul.models.three_ds
• Support for token-based hold transactions with 3D Secure authentication
• Integration with existing DataVault token infrastructure
• Compatible with manual capture workflows in payment providers

Key Capabilities

• Pre-authorize payments using saved tokens without immediate capture
• 3D Secure authentication for token hold transactions
• Validation and error handling for secure payment processing
• Flexible challenge flows supporting method notifications and challenges
• Session management for complex 3DS authentication workflows

Model Features

• Required fields: Store, Amount, DataVaultToken, OrderNumber, CardHolderInfo, ThreeDSAuth
• Validated TrxType field (must be "Hold")
• DataVaultToken format validation with UUID pattern
• ForceNo3DS control ("0" or "1")
• Optional fields: Itbis, CVC, CardNumber, CustomOrderId

🧪 Comprehensive Test Coverage

Unit Tests (8 test cases)

• Model validation and serialization
• Required field enforcement
• Pattern validation for critical fields
• Default value verification

Service Tests (5 test cases)

• 3DS authentication workflows
• Challenge and method notification handling
• Error scenarios and edge cases
• Complete token hold processing

Integration Tests (3 test cases)

• Real API interaction with Azul servers
• End-to-end token hold workflows
• Session data management and validation

🎯 Use Cases

• E-commerce pre-authorization: Hold funds at order time, capture at fulfillment
• Subscription renewals: Authorize recurring payments using saved tokens
• Manual review workflows: Pre-authorize high-value transactions for review
• Inventory management: Hold payment while confirming product availability

🔧 Technical Details

• Extends existing 3DS authentication framework
• Compatible with current SecureSale and SecureTokenSale implementations
• Follows established PyAzul patterns for async operations
• Supports both frictionless and challenge-based 3DS flows