Rename the RabbitMQ options type to make its purpose explicit and update all consumers in the RabbitMQ, Infrastructure, Publisher, Client and test projects. Inline the connection factory registration in the DI extensions instead of the private AddDefaultServices helper.
BREAKING CHANGE: RabbitMqConfiguration is now RabbitMqConnectionConfiguration.
Enhanced test coverage for RabbitMQ integration by adding:
- New package references for dependency injection, logging, and RabbitMQ.
- `EmailSenderCollection` and `EmailSenderFixture` for managing static client lifecycle in integration tests.
- Integration tests for `EmailSender` and `OutgoingEmailPublisher` to verify connection management, message publishing, and serialization.
- `EmailSenderUrlOverloadTests` to validate URL-based connection overload behavior.
- `RabbitMqTestConfig` for centralized RabbitMQ test configuration.
- Unit tests for URL parsing logic in `EmailSenderUrlParsingTests`.
These changes improve reliability, maintainability, and test coverage for the messaging service.
