[PoC] Add GeoSearch Index and search

[menthol]

Proof of the concept of creating a GeoSearch Index.
The index is maintained at the same time as the main index.
To call up the GeoSearch Index search:

// $builder->query should be passed as an array
$params = [
  'locaton' => [
    'longitude' => $lng, // float
    'latitude' => $lat, // float
  ],
  'distance' => $distance, // float
  'limit' => $limit, // integer optional
];

Address::search($params);

Fix #170 #235