input: Write a python function to start a WebSocket server that listens for messages and prints them to the console.
  assert isinstance(hello, object)
  assert isinstance(hello_server, object)
output: import asyncio
  import websockets
  
  async def echo(websocket, path):
      async for message in websocket:
          print(message)
  
  def start_websocket_server():
      start_server = websockets.serve(echo, "localhost", 8765)
      
      asyncio.get_event_loop().run_until_complete(start_server)
      asyncio.get_event_loop().run_forever()