style: two lines between top level declarations

ref: N25B-236

src/robot_interface/core/config.py

@@ -14,6 +14,8 @@ class AgentSettings(object):
         self.main_receiver_port = main_receiver_port
         self.video_sender_port = video_sender_port
         self.audio_sender_port = audio_sender_port
+
+
 class VideoConfig(object):
     """Video configuration constants."""
     def __init__(
@@ -31,17 +33,23 @@ class VideoConfig(object):
         self.fps = fps
         self.stream_name = stream_name  
         self.image_buffer  = image_buffer
+
+
 class AudioConfig(object):
     """Audio configuration constants."""
     def __init__(self, sample_rate=16000, chunk_size=512, channels=1):
         self.sample_rate = sample_rate
         self.chunk_size = chunk_size
         self.channels = channels
+
+
 class MainConfig(object):
     """Main configuration"""
     def __init__(self, poll_timeout_ms=100, max_handler_time_ms=50):
         self.poll_timeout_ms = poll_timeout_ms
         self.max_handler_time_ms = max_handler_time_ms
+
+
 class Settings(object):
     """Global settings container."""
     def __init__(self, agent_settings=None, video_config=None, audio_config=None, main_config=None):