[openstreetmap/openstreetmap-website] Integrate the high-performance GPX importer (#1852)

[Andy Allan]

> Assuming that an import takes less than 5 seconds, we could as well do everything in a synchronous way.

I don't think this is a good idea. If a group of people upload a burst of gpx files in parallel (e.g. 1000 files) and each takes 5 seconds of CPU time, then that can tie up all the threads on the servers for a while. We already have a system to prevent people from having too many queued for processing. Best to keep the  queue, so that they can be processed in the background, even if there's a spike of activity.

With proper integration into the site, we can show the user the number of their uploads that are pending, display a notification on the site when they are done, etc. I'm just not in favour of doing anything synchronously that could be done in the background.

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