Add order-fulfillment-compensation example

[mcruzdev]

This pull request introduces a new example project, order-fulfillment-compensation, which demonstrates the Saga (compensation) pattern for distributed transactions using Quarkus Flow. The example includes a complete workflow implementation, real-time UI updates via WebSocket, and comprehensive documentation to help users learn about error handling and compensation in distributed systems.

The most important changes are:

New Example Project: Order Fulfillment with Compensation

• Added a new Maven module (pom.xml) for order-fulfillment-compensation, specifying dependencies on Quarkus, Quarkus Flow, WebSockets, and test libraries.
• Created a detailed README.md explaining the Saga pattern, compensation logic, workflow steps, test scenarios, architecture, and extension ideas for the example.

Workflow Implementation

• Implemented OrderFulfillmentWorkflow.java, which defines the order fulfillment process using Quarkus Flow's fluent DSL, including try-catch blocks for each step, compensation functions, and error handling strategies.
• Business logic methods simulate success and failure for stock reservation, payment processing, and shipping, with compensation methods that cascade rollbacks as needed.
• Integrated real-time workflow state broadcasting via WebSocket to the UI for live visualization of workflow progress and compensation.

Closes #471