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

[Ben Kochie]

Add a Prometheus `/metrics` endpoint based on the modtile_collector[0]
script.
* Minor metric naming cleanup.
* Drops duplicate TileBufferReads metrics that duplicate the per-zoom values.

Related to: https://github.com/openstreetmap/operations/issues/492

[0]: https://github.com/openstreetmap/prometheus-exporters/blob/main/collectors/modtile/modtile_collector

Signed-off-by: Ben Kochie <superq at gmail.com>
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/222

-- Commit Summary --

  * Add a Prometheus metrics endpoint

-- File Changes --

    M src/mod_tile.c (96)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/222.patch
https://github.com/openstreetmap/mod_tile/pull/222.diff

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