dates for creators map as "single" dates even though most are ranges

[graykr]

I am not sure if there is an implication now, but it seems like there could be for the future use of this data.

Can we test the date expression to see if it looks like a range, and if so, put it in as a range? Ideally we'd also populate the normal date information for the date expression.

Here is the relevant source code:

if(record.has("Dates") && !record.getString("Dates").isEmpty()) {
            JSONArray datesJA = new JSONArray();
            JSONObject dateJS = new JSONObject();
            dateJS.put("date_type", "single");
            dateJS.put("label", "existence");
            dateJS.put("expression", record.get("Dates"));
            datesJA.put(dateJS);
            agentJS.put("dates_of_existence", datesJA);
        }

https://github.com/archivesspace/archon-migration/blob/5ab5bc4aed3607a71923ec91e0a515680c361f7b/src/org/nyu/edu/dlts/utils/ASpaceMapper.java#L417C9-L425C10