This adds selected attributes that vary across individual instances within the series, tying them to the instances via SOPInstanceUID.
Series-level attributes (including storage bucket folder containing the series) are expected to be accessible by JOIN on the included SeriesInstanceUID.
Follow up on #15 and https://github.com/ImagingDataCommons/idc-index/issues/97
This adds selected attributes that vary across individual instances within the series, tying them to the instances via SOPInstanceUID.
Series-level attributes (including storage bucket folder containing the series) are expected to be accessible by JOIN on the included SeriesInstanceUID.