Only throw `RabbitMQ.Client`-specific exceptions.

[paulomorgado]

Describe the bug

From Using Standard Exception Types:

❌ DO NOT throw System.Exception or System.SystemException.

RabbitMQ code should return RabbitMQ exceptions. If there was another exception causing the one being thrown, it should be added as an InnerException.

Reproduction steps

ServiceBase.Notify is throwing System.Exception at https://github.com/rabbitmq/rabbitmq-dotnet-client/blob/main/projects/RabbitMQ.Client/client/impl/SessionBase.cs#L128

Expected behavior

a RabbitMQ-specific exception is thrown.

Additional context

No response