Exclude "Unit" in Measurement Offloading

Challenge: Due to the nature of their data, we face the challenge of producing very wide measurement tables. This is particularly an issue as each measurement produces two columns in the target table: value and unit. Data Lake Team of Enercon claimed already they have no use of the Unit at all - the unit information comes from another system.

Idea: introduce an option to the offloading to exclude Units from Measurement offloading.

Benefits: Decrease the number of colums by 50% + less storage needed on DL side.