sensors: move accel filtering to sensors/vehicle_acceleration

I've added a queue depth of 4 for sensor_accel and sensor_gyro. This is initially added because it's not always possible for the `vehicle_acceleration` to keep up with every publication of the primary accelerator as it runs in the same thread as ekf2, various controllers, etc. 

Later this mechanism will be used in a few areas
 - rate limit `vehicle_angular_velocity` and `vehicle_acceleration` without missing any raw data
 - move IMU integration to `vehicle_imu` and out of the actual driver threads, eliminating the need for sensor_accel_integrated and sensor_gyro_integrated
 - integrate raw gyro synchronized with optical flow measurements

src/modules/simulator/simulator.h

@@ -103,7 +103,6 @@ public:
 private:
 	Simulator() : ModuleParams(nullptr)
 	{
-		_px4_accel.set_sample_rate(250);
 	}
 
 	~Simulator()