mod_restrict_xmpp: Treat archive query as a read despite using iq-set
XEP-0313 uses iq-set to initiate a query, but unlike many other uses of
iq-set, this does not mutate anything on the server, so it should not be
treated as a write request.
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summary: Block s2s connections based on admin blocklists
...
This module uses the blocklists set by admins for blocking s2s
connections.
So if an admin blocks a bare domain using [Blocking Command][xep191]
via [mod\_blocklist][doc:modules:mod_blocklist] then no s2s connections
will be allowed to or from that domain.