Provides a `GET` endpoint to return postal code matchers
as well as examples by parsing localization from a session.

GET /api/locations/countries/postal-code-matchers
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "examples": "6001, 6015, 6332, 8252, 1030",
    "matchers": [
        "^(^\\d{4}$)$"
    ]
}