add: explicit definition of demographics datadict
add: explicit definition of demographics datadict

sibis-platform/ncanda-data-integration,sibis-platform/ncanda-datacore,kipohl/ncanda-data-integration,sibis-platform/ncanda-data-integration,kipohl/ncanda-data-integration,sibis-platform/ncanda-datacore,kipohl/ncanda-data-integration,sibis-platform/ncanda-datacore