Move fetching of sensor data to service

[marcnause]

Actual Behaviour

During testing of #2576 it became clear that some sensors need some time after initialization to send valid data. In the implementation suggested in #2576 the sensors are initialized on every orientation change which results in missed and in invalid data in orientation change.

Expected Behaviour

The sensor should not be re-initialized on orientation change and fetching sensor data should not be stopped on orientation change. This may be prevented by moving the fetching of sensor data to a service.

Steps to reproduce it

Attach a sensor to the PSlab board, attach the board to the phone, open appropriate sensor activity, change orientation. There should be a gap in the data diagram.

Screenshots of the issue
In the following screenshot I have changed the orientation twice which resultes in two gaps.

Would you like to work on the issue?

Maybe