sim: add imu fake

sim/fakes/imu.py

+from typing import Tuple
+
+
+def acc_read() -> Tuple[float, float, float]:
+    """
+    Returns current x, y, z accelerations in m/s**2.
+    """
+    return (1.0, 2.0, 3.0)
+
+
+def gyro_read() -> Tuple[float, float, float]:
+    """
+    Returns current x, y, z rotation rate in degrees/s.
+    """
+    return (4.0, 5.0, 6.0)
+
+
+def pressure_read() -> Tuple[float, float]:
+    """
+    Returns current pressure in Pa and temperature in degree C.
+    """
+    return (7.0, 8.0)