[Tile-serving] [openstreetmap/osm2pgsql] Provide tmp .osc.gz file to post processing script (Issue #1719)

[Branko Kokanovic]

Sorry if I was not being more details, it looked like an easy addition, but you are right.

Scenario:
I would like to keep my local postgis minutely up-to-date and also stream all .osc changes further down the pipeline. My scenario is monitoring and processing changes, think about real-time [monitoring tools ](https://wiki.openstreetmap.org/wiki/Quality_assurance#Monitoring_Tools), for example how would you recreate today [osm-watch](https://wiki.openstreetmap.org/wiki/Osm-watch) tool, or how would this [restaurant notifier](https://try-something-new.web.app/) be implemented in OSM. So, I basically would like to use all the easiness of osm2pgsql use, and enrich .osc data with postgis data and process it further.

P.S. I already implemented it for my needs, but I though this might be interesting to everyone

P.P.S. Slightly related to this (but I would open new issue if you are OK with it) is concept of "pre-processing". Idea is to enable scenarios where one can hook trim_osc.py to in-place edit .osc files *before* they are sent to osm2pgsql and to be able to compare old (in postgis) and new (in .osc) data for contextual differences. This "pre-processing" would also have path to temp .osc file as parameter.

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