[openstreetmap/openstreetmap-website] Add MAPS.ME authentication (#1433)

[Ilya Zverev]

> There is (to my mind) a key difference though - this is not an existing authentication provider that has set itself up as a general service and we have then chosen to offer to our users, rather it is an authentication provider that has been created specifically for the purpose of interacting with OpenStreetMap.

Actually, it is created for the purpose of better communicating with maps.me users. It will be included in maps.me soon, regardless of the state of this PR. And most our users, at least ten million (as we expect) will be registered there. If there is another application with millions of users, then why not add their service too (or connect them to ours).

The authentication endpoint in this request is created not because we want to route editors through our service, but because we want to minimize the hassle with two registrations, which means, to increase the number of people registering in OSM and editing it through our app.

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