Part of the work required for the data pipeline V2: https://linear.app/commonknowledge/issue/MAP-973/planning-for-data-import-pipeline-v2

This adds a new Geocoder: AREA_CODE_GEOCODER_V2. To enable it, the geocoding config must have only one element, with the "type" set to "area_code".

This Geocoder uses dataloaders to ensure maximum parallelisation.

To Test

Add an AreaData source, where each row is identified to an area by code. Set up the geocoding_config to look something like:

  "type": "AREA",
  "components": [
    {
      "type": "area_code",
      "field": "oa21cd",
      "value": "",
      "metadata": {
        "lih_area_type__code": "OA21"
      }
    }
  ]
}```

Then run the import on the data source.