Add Message Broker Interface and Implementations for Azure Service Bus, RabbitMQ, and In-Memory Messaging

[jacobwi]

Develop a generic message broker interface to abstract the messaging infrastructure in our application, allowing for decoupled communication between different parts of the system. Implement concrete contracts for Azure Service Bus, RabbitMQ, and an in-memory messaging system to provide flexibility and adaptability in our messaging solutions based on different environments and requirements.

---

Objectives:
Design a generic message broker interface that supports publish/subscribe and send/receive patterns.
Implement the interface with Azure Service Bus for cloud-based environments.
Implement the interface with RabbitMQ for on-premise or Docker container-based environments.
Provide an in-memory implementation for testing and development environments without external dependencies.
Ensure seamless switching between different implementations through configuration.