Add MessageId to RabbitMQ message properties. (#1740)

This commit introduces a new line of code that sets the
`MessageId` property of the `BasicProperties` object using
the `GetId()` method from the `message` object. This
enhancement ensures that each message published to RabbitMQ
includes a unique identifier, improving traceability and
message management.

Author: yang-xiaodong

src/DotNetCore.CAP.RabbitMQ/ITransport.RabbitMQ.cs

@@ -36,6 +36,7 @@ public async Task<OperateResult> SendAsync(TransportMessage message)
 
             var props = new BasicProperties
             {
+                MessageId = message.GetId(),
                 DeliveryMode = DeliveryModes.Persistent,
                 Headers = message.Headers.ToDictionary(x => x.Key, object? (x) => x.Value)
             };