mod_rest: Add configuration of which stanzas to route to callback Makes it simpler to build APIs that only handle a certain kind of stanzas, letting them be handled by the unhandled stanza handler instead of having to write code to ignore certain kinds of stanzas.

[Install]
WantedBy=sockets.target

[Socket]
ListenStream=0.0.0.0:5269
ListenStream=5269
BindIPv6Only=ipv6-only
Accept=false
Service=prosody.service