LoggerService offers additional filter methods for request headers and other advantages which other modules can resuse. We can move LoggerService in zmscitizenapi to zmsslim.

https://github.com/it-at-m/eappointment/blob/next/zmsslim/src/Slim/Bootstrap.php#L77
https://github.com/it-at-m/eappointment/blob/next/zmscitizenapi/src/Zmscitizenapi/Services/Core/LoggerService.php