Add default edit rate limit of 90 edits/minute for all users

Previously there was no rate limit at all if you were autoconfirmed.

This initial setting is set on the high end of things, we may
adjust later. See also T192668, T194204.

Change-Id: I7cb002900bae2da3f4f4758671186659c1720e1d
(cherry picked from commit cefdcefdb8f15ffdec8345b93aff2036db92d1f7)