Merge branch 'PD-1141' into 'master'

PD-1141 entities. Add DatasetColumnType

See merge request !45

entities/enum.go

@@ -5,6 +5,7 @@ type EntityType string
 const (
 	DatasetLocalType     EntityType = "dataset-local"
 	DatasetJoinType      EntityType = "dataset-join"
+	DatasetColumnType    EntityType = "dataset-column"
 	DataSourceType       EntityType = "datasource"
 	HTMLEditorType       EntityType = "html-editor"
 	FlatTableType        EntityType = "flat-table"