added reply with surbs example to rust sdk examples dir

sdk/rust/nym-sdk/examples/surb-reply.rs

@@ -1,5 +1,5 @@
 use nym_sdk::mixnet::{
-    AnonymousSenderTag, MixnetClient, MixnetClientBuilder, ReconstructedMessage, StoragePaths,
+    AnonymousSenderTag, MixnetClientBuilder, ReconstructedMessage, StoragePaths,
 };
 use std::path::PathBuf; 
 
@@ -8,7 +8,7 @@ async fn main() {
     nym_bin_common::logging::setup_logging();
 
     // Specify some config options
-    let config_dir = PathBuf::from("/tmp/surb-example-client");
+    let config_dir = PathBuf::from("/tmp/surb-example");
     let storage_paths = StoragePaths::new_from_dir(&config_dir).unwrap();
 
     // Create the client with a storage backend, and enable it by giving it some paths. If keys