Throttle report endpoint
Related to #2663 but in the form of a feature request rather than a question.
This is a proposal to add a rate limiter to the report endpoint so that it cannot easily be used as a SPAM vector. I have had issues from one person who has sent out dozens of reports in the timeframe of a few minutes, sending notifications to my E-mail and causing a lot of noise. For one actor, this is easy to deal with, since the account can be deactivated and all associated reports from that actor disappear.
For Mastodon anonymised reports, though, this is more difficult to deal with, because deactivating a service actor will prevent that instance from sending reports entirely.
admin-fe#149 would also be useful for handling such reports en masse.
Edited by opal hart