fix(pkg/config): use storage endpoints

changes:
- Only one storage endpoint can be defined. This consists of a URL which
  can be used to specify whether the data is to be stored in a file or
  in a database.

pkg/sensor/interfaces.go

@@ -10,6 +10,6 @@ import (
 type Sensor interface {
 	GetSensorModel() types.SensorModel
 	Read() ([]*types.MeasuredValue, error)
-	ReadChannel(measuredValuesChannel chan<- []*types.MeasuredValue, errorChannel chan<- error, wg *sync.WaitGroup)
-	ReadContinously(ctx context.Context, measuredValuesChannel chan<- []*types.MeasuredValue, errorChannel chan<- error)
+	ReadChannel(measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error, wg *sync.WaitGroup)
+	ReadContinously(ctx context.Context, measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error)
 }