LMS-2294 data set type code added to feature matrix annotations.

screening/source/java/OpenBISScreeningML.java

...creening/client/api/v1/ScreeningOpenbisServiceFacade.java

...in/screening/server/logic/FeatureVectorDatasetLoader.java

.../plugin/screening/server/logic/HCSImageDatasetLoader.java

.../plugin/screening/shared/api/v1/dto/DatasetReference.java

...ning/shared/api/v1/dto/FeatureVectorDatasetReference.java

.../shared/api/v1/dto/FeatureVectorDatasetWellReference.java

...ening/shared/api/v1/dto/FeatureVectorWithDescription.java

...in/screening/shared/api/v1/dto/ImageDatasetReference.java

screening/sourceTest/java/OpenBISScreeningMLTest.java