Split out ability to upload flyover data from pool uploads

Tons of changes here, all in the name of quickly getting to where I can
create test compliance letters.

db/migrations/00075_address_parcel_geom_index.sql

@@ -0,0 +1,3 @@
+-- +goose Up
+CREATE INDEX idx_address_geom ON address USING GIST (geom);
+CREATE INDEX idx_parcel_geometry ON parcel USING GIST (geometry);