logger: add additional websockets.asyncio imports to support async client connections

Signed-off-by: YoungSoo Shin <shinys000114@gmail.com>

example/logger/logger.py

@@ -3,6 +3,9 @@ import asyncio
 import csv
 import requests
 import websockets
+import websockets.asyncio
+import websockets.asyncio.client
+import websockets.exceptions
 from datetime import datetime, timezone
 
 # Import the status_pb2.py file generated by `protoc`.