[openstreetmap/openstreetmap-website] add bulk_upload (#1995)

[mmd]

@jiaxuyang  : thanks for the update, looks good so far!

@tomhughes : the functional issues I have reported earlier seem to be fixed now,. I will continue testing the code, though. If you like, you could maybe have a look through the code to see if the coding style is ok, overall code complexity is still reasonable, etc.

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