- default enviroments for prod, test stage
- used defaults env can just be referenced via name in config.yaml
- custom envs can be added dynamically 

refactoring: merge DestinationService, Portalservice and KeyService to a sinblge services that deals with keys, use eventlogvirfier in eventLogService to reduce dependencies in sender and subscriber facade

refactor(config): remove metadata schema from config, file is loaded implicitly via factory from resources so the user does not have to provide a schema

- Rework der Applicationconfig zu yaml