Add nested IDC `dicom_all` columns used by CDA ETL to column-value counters

this refers to output produced under `auxiliary_metadata/__column_value_statistics/`

columns to do:

* `AnatomicRegionSequence`
* `SpecimenDescriptionSequence`
* `SegmentSequence`
* `RTROIObservationsSequence`
* `SharedFunctionalGroupsSequence`