IMS schema trigger to keep study_sts_stat.last_viewed_dttm in sync with exam_sts_stat

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Description

Adding a trigger to the ims schema to copy any value update of the exam_sts_stat.last_viewed_dttm column to all related studies in the study_sts_stat table which would allow CAM to purge without issues, and not require any rework on other products like RA1000 or AIM.