Implement Geocoder client

[draperunner]

An implementation of the Geocoder API that is closer to the API and uses proper GeoJSON types.

• sdk.geocoder.autocomplete
• sdk.geocoder.reverse

Both methods return FeatureCollection<Point, GeocoderTypes.Location>, where the GeoJSON types (FeatureCollection, Feature, Point) are from the commonly used @types/geojson package.

The types used for these methods are namespaced under GeocoderTypes, the same way it's done for MobilityTypes and NsrTypes.

camelCase formatting is used for those parameters that use snake_case in the API, otherwise all names are true to the API. Dot-separated parameters like point.lat=60 are objects in this SDK: { point: { lat: 60 } } .

[kseverinsen]

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