Updating client module visibility as per review comments

Co-authored-by: Heath Stewart <heaths@microsoft.com>

Author: lsiddiquee

sdk/storage/azure_storage_queue/src/clients/mod.rs

@@ -1,7 +1,7 @@
-pub mod queue_client;
+mod queue_client;
 pub use queue_client::QueueClient;
 
-pub mod queue_service_client;
+mod queue_service_client;
 pub use queue_service_client::QueueServiceClient;
 
 pub use crate::generated::clients::{QueueClientOptions, QueueServiceClientOptions};