Add constructor for the DistanceMatrix class

- `DistanceMatrix.from_addresses()` takes a variable number of
  `Address` objects and creates distance matrix entries for them
- as a base measure, the air distance between two `Address`
  objects is calculated
- in addition, an integration with the Google Maps Directions API is
  implemented that provides a more realistic measure of the distance
  and duration a rider on a bicycle would need to travel between two
  `Address` objects
- add a `Location.lat_lng` convenience property that provides the
  `.latitude` and `.longitude` of an `Address` as a 2-`tuple`

src/urban_meal_delivery/db/utils/locations.py

@@ -7,7 +7,7 @@ from typing import Optional, Tuple
 import utm
 
 
-class Location:
+class Location:  # noqa:WPS214
     """A location represented in WGS84 and UTM coordinates.
 
     WGS84:
@@ -67,6 +67,11 @@ class Location:
         """
         return self._longitude
 
+    @property
+    def lat_lng(self) -> Tuple[float, float]:
+        """The `.latitude` and `.longitude` as a 2-`tuple`."""
+        return (self._latitude, self._longitude)
+
     @property
     def easting(self) -> int:
         """The easting of the location in meters (UTM)."""