Refactor emergency inReach documents

[alexgao1]

Servlet should take inReach messages and create an inReach key, not just "nunaliit_schema": "inReach", and create relevant Nunaliit objects within that key.
For the emergency documents, we want to copy the following:

Item.Message
Item.EmergencyState
Item.Position.GpsTimestamp
create a nunaliit_geom based on the Item.Position data
create a nunaliit_date (based on the existing NunaliitTimestamp but move it into this newly proposed schema key)