Add GeoSpatial backends for geocoding

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Geospatial Backend

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

test/support/mocks/geospatial_mock.ex

@@ -0,0 +1,15 @@
+defmodule Mobilizon.Mobilizon.Service.Geospatial.Mock do
+  @moduledoc """
+  Mock for Geospatial Provider implementations
+  """
+  alias Mobilizon.Service.Geospatial.Provider
+  alias Mobilizon.Addresses.Address
+
+  @behaviour Provider
+
+  @impl Provider
+  def geocode(_lon, _lat, _options \\ []), do: [%Address{}]
+
+  @impl Provider
+  def search(_q, _options \\ []), do: [%Address{}]
+end