[LMS-1491] listing feature vectors; introduced CsvFileReaderHelper

...d/openbis/dss/generic/server/TabularDataGraphServlet.java

...server/graph/TabularDataGraphCollectionConfiguration.java

.../openbis/dss/screening/server/DssServiceRpcScreening.java

...bis/plugin/screening/shared/api/v1/dto/FeatureVector.java

...gin/screening/shared/api/v1/dto/FeatureVectorDataset.java

...urce/java/ch/systemsx/cisd/utils/CsvFileReaderHelper.java

...nbis/dss/screening/server/DssServiceRpcScreeningTest.java