Support localityWide: populate localities static json files

[vbuch]

Create a script that will extract localities from https://urbandata.sofia.bg/dataset/districts-of-sofia-municipality and populate them under /ingest/localities next to bg.sofia.geojson.

E.g.

      "properties": {
        "id": 3,
        "obns_num": "09",
        "obns_cyr": "ЛОЗЕНЕЦ",
        "obns_lat": "LOZENEC"
      },

the file should be named bg.sofia.lozenec.geojson following the obns_lat naming.
The sccript must be rerunnable but doesn't need to be scheduled for regular running.