feat: Add log message after successful dumped

upsonic/remote/on_prem.py

@@ -869,6 +869,7 @@ def set(self, key:str, value, message:str=None) -> bool:
             if response["status"] is True:
                 if self.tester:
                     self.print_current_datetime()
+                    print("Dumped.")
                 return True
         else:
             return False