[openstreetmap/openstreetmap-website] Add OpenMapTiles vector map (PR #4042)

[Martin Ždila]

This pull request adds OpenMapTiles vector tiles among the featured layers. To ensure compatibility with the current stack based on Leaflet, it uses maplibre-gl-leaflet binding. 
The main advantage for users is support for labels in multiple languages: users can easily switch by changing language preferences in settings.

![196365626-243c978f-256c-4a53-a6a7-aee2d63f6c74](https://github.com/openstreetmap/openstreetmap-website/assets/636095/d5e4dbb2-ca44-4df4-8d48-609097e9291a)

An official email with a link to this PR was sent, together with an [edit of the “Featured tile layers” wiki page](https://wiki.openstreetmap.org/wiki/Featured_tile_layers).
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4042

-- Commit Summary --

  * Add OpenMapTiles OSM vector map

-- File Changes --

    M app/assets/javascripts/leaflet.map.js (59)
    M config/locales/en.yml (3)
    M package.json (3)
    M yarn.lock (231)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4042.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4042.diff

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