[Tile-serving] [openstreetmap/osm2pgsql] Timestamp of last change of object in database (#923)

[Tomas Straupis]

It would be useful to have a possibility to have a database column with the timestamp of last update (database update, not OSM update) of the row (change of attributes and/or geometry).

Something similar to what we would get with PostgreSQL trigger on insert/update of points/lines/polygons tables setting the value of such new column to current timestamp.

**Reasons:**
- In case where additional pre-processing of data is required before rendering maps, this would allow reducing the number of objects to be pre-processed.
- Extra attributes like _osm_timestamp_ had something similar but after GDPR public extracts of OSM data no longer have _timestamp_ data.

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https://github.com/openstreetmap/osm2pgsql/issues/923
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