[Tile-serving] [openstreetmap/mod_tile] Add a Prometheus metrics endpoint (#222)

[ǝɹʇʇɐʃǝ◖ xıʃǝɟ]

Thanks a lot for this PR! Especially now, that the OSM tech team is moving to prometheus this is super useful. May you please reroll your PR on the latest `master`? This will include some CI checks.

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