Support reading lm-sensors configuration

[peterhoeg]

Checklist

• [X] I've looked through the documentation and existing open issues for similar feature requests.

Describe the feature request

On Linux at least when one is using lm-sensors to read sensor data, it's possible to configure both how values are calculated but also which sensors to ignore.

In order to avoid having to duplicate this configuration for btm, it would be very elegant if btm could parse the lm-sensors configuration at the very least in order to figure out which sensors to ignore (it's essentially ignore <sensorname>).

What makes it tricky is of course having to match it against the right board.

There are some examples here: https://github.com/lm-sensors/lm-sensors/blob/master/configs/