Add CMake format and linter (!89)

## What is the new feature
Add a formatter for CMake files. And CI task for CMake formatting is also added.

## How is it implemented
We use the opensource tool https://github.com/cheshirekow/cmake_format

 for formatting.

Approved-by: Jonas Jucker <jonas.jucker@env.ethz.ch>
Merged-by: Jonas Jucker <jonas.jucker@env.ethz.ch>
Changelog: feature