Refactor python module structure

tracking/lidar_servicer.py

@@ -0,0 +1,22 @@
+import tracking.lidar_tracker_pb2 as lidar_tracker_pb2
+from tracking.lidar_tracker_pb2_grpc import PersonTrackingServicer
+from tracking.lidar_cache import LidarCache
+from multiprocessing import Process
+
+
+class LidarServicer(PersonTrackingServicer):
+
+    def __init__(self):
+        self.cache = LidarCache(measurements=100)
+
+    def set_tracking_group(self, request, context):
+        pass
+
+    def stop_tracking(self, request, context):
+        self.cache.stop_scanning()
+
+    def start_tracking(self, request, context):
+        '''
+        Starts the lidar cache. 
+        '''
+        self.cache.start_cache()