Control aloha robot natively (#316)

Co-authored-by: Simon Alibert <75076266+aliberts@users.noreply.github.com>

lerobot/common/robot_devices/utils.py

@@ -1,3 +1,15 @@
+import time
+
+
+def busy_wait(seconds):
+    # Significantly more accurate than `time.sleep`, and mandatory for our use case,
+    # but it consumes CPU cycles.
+    # TODO(rcadene): find an alternative: from python 11, time.sleep is precise
+    end_time = time.perf_counter() + seconds
+    while time.perf_counter() < end_time:
+        pass
+
+
 class RobotDeviceNotConnectedError(Exception):
     """Exception raised when the robot device is not connected."""