feat: Ensure Single RabbitMQ Connection and Validate Properties

[luisgomez29]

This PR introduces key improvements to the system's robustness and efficiency:

1. Ensures that a single physical connection to RabbitMQ is created and reused throughout the application.
2. Adds validations to make the listenReplies configuration property and the app domain mandatory, preventing ambiguous behavior and runtime errors.

[juancgalvis]

🎉 This PR is included in version 5.6.2-beta.1 🎉

The release is available on GitHub release

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