[openstreetmap/openstreetmap-website] Limit number of edits per user and day (#2342)

[mmd]

> I think it's worth discussing it here too, particularly if we want to ensure clear messaging to the user when they go over any quota.

For a clear messaging we'd need something better than _You have downloaded too much data. Please try again later._ with comes with an  _HTTP 509 Bandwidth Limit Exceeded_ error response.

Also, both downloads and uploads currently share the same user-based key in memcache. A user downloading lots of data might be impacted when trying to upload some changes (and vice versa). I don't know if this is good idea. On the other hand, if memcache memory permits, we might as well introduce a dedicated key only used for changeset upload tracking.

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