serve gzip compressed GPX data if possible

This way, we not only save the decompression time, we can also save
bandwidth! We *might* even consider using brotli, which seems to be
widely supported and has even better compression ratios, but brotli
compression of full efficiency is also slow.

Ideally, we'd save a "fast compressed" version of the GPX file on
upload, and then have a slower background-queue re-compress them with
higher settings. That however should probably wait till we move the GPX
data out of the database(?!), then we can even serve the data straight
with a FileResponse.

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