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

[Tom Hughes]

Yes that's because that name is now used for both per-zoom and per-layer statistics :-(

I've got a [spreadsheet](https://docs.google.com/spreadsheets/d/1x3ZlLlMn3UXnfMtC7JxJ0M-RfljJ0eWVVwT5mwUmv10/edit?usp=sharing) comparing the traditional names, what my script used and what this PR is currently doing.

The cell in red is the problem because it duplicates the name used further down.

The final column is my suggestion to fix it and also my outstanding suggest about the buffer read statistics, though I'm not hugely bothered if that isn't used.

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