Empty avg duration in Visit Occurrence report

[dimshitc]

Empty "avg duration" in Visit Occurrence report, and when looking at the export query https://github.com/OHDSI/Achilles/blob/main/inst/sql/sql_server/export/visit/sqlVisitTreemap.sql it indeed doesn't have the duration as output. Error exists both in main and beta versions

[fdefalco]

need to add distribution values from achilles_results_dist to visit_occurrence, visit_detail, drug_era, and condition_era exports in AOExport function.