Look into potential visit ID assignment bug

[katy-sadowski]

Encounter ID bd0581d7-28e9-30e9-7e4a-846556992490 appears in dbt's visit_occurrence table but not ETL-Synthea's. Encounter ID d910aaaf-872f-dabd-c0f1-742eacdde64c appears in ETL-Synthea's visit_occurrence but not dbt's. I think it has to do with the way IDs are being assigned here and then prioritization rules are assigned here.

This is also impacting the cost table, which links into the visit tables to get cost information for events. Thus costs are being calculated differently, and there are some discrepancies in the presence/absence of cost rows, as events are being linked to different encounters in the 2 runs.

[katy-sadowski]

Duplicated by #47