Updating XEP-0060 Publish-Subscribe

[JanuszJakubiec]

Include a feature of http://jabber.org/protocol/pubsub#rsm in disco#info response.

Check preconditions when accepting publish-options along with a publish request. We have two node types which advertise support for the publish-options feature.
In node push the preconditions are not checked. This node type is supporting xep-0163.
In node pep the changes are implemented, and the publish-options are being checked.

[codecov]

Codecov Report

Patch coverage: 96.87% and project coverage change: +0.04% 🎉

Comparison is base (dec621e) 83.85% compared to head (ea8e8ce) 83.90%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4092      +/-   ##
==========================================
+ Coverage   83.85%   83.90%   +0.04%     
==========================================
  Files         551      551              
  Lines       33568    33594      +26     
==========================================
+ Hits        28149    28186      +37     
+ Misses       5419     5408      -11     

Files Changed	Coverage Δ
src/event_pusher/mod_event_pusher_push.erl	94.68% <ø> (ø)
src/pubsub/mod_pubsub.erl	75.82% <94.44%> (+0.51%)	⬆️
src/pubsub/node_pep.erl	82.25% <100.00%> (+2.62%)	⬆️
src/pubsub/node_push.erl	90.00% <100.00%> (-3.11%)	⬇️

... and 11 files with indirect coverage changes

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[mongoose-im]

elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / ea8e8ce
Reports root/ big
OK: 369 / Failed: 0 / User-skipped: 38 / Auto-skipped: 0

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small_tests_24 / small_tests / ea8e8ce
Reports root / small

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small_tests_25 / small_tests / ea8e8ce
Reports root / small

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small_tests_25_arm64 / small_tests / ea8e8ce
Reports root / small

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ldap_mnesia_24 / ldap_mnesia / ea8e8ce
Reports root/ big
OK: 2274 / Failed: 0 / User-skipped: 831 / Auto-skipped: 0

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dynamic_domains_mysql_redis_25 / mysql_redis / ea8e8ce
Reports root/ big
OK: 4201 / Failed: 0 / User-skipped: 116 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / ea8e8ce
Reports root/ big
OK: 4233 / Failed: 0 / User-skipped: 84 / Auto-skipped: 0

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ldap_mnesia_25 / ldap_mnesia / ea8e8ce
Reports root/ big
OK: 2274 / Failed: 0 / User-skipped: 831 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / ea8e8ce
Reports root/ big
OK: 4233 / Failed: 0 / User-skipped: 84 / Auto-skipped: 0

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internal_mnesia_25 / internal_mnesia / ea8e8ce
Reports root/ big
OK: 2420 / Failed: 0 / User-skipped: 685 / Auto-skipped: 0

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dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / ea8e8ce
Reports root/ big
OK: 4230 / Failed: 0 / User-skipped: 87 / Auto-skipped: 0

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pgsql_mnesia_24 / pgsql_mnesia / ea8e8ce
Reports root/ big
OK: 4622 / Failed: 0 / User-skipped: 91 / Auto-skipped: 0

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pgsql_cets_25 / pgsql_cets / ea8e8ce
Reports root/ big
OK: 4592 / Failed: 0 / User-skipped: 121 / Auto-skipped: 0

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pgsql_mnesia_25 / pgsql_mnesia / ea8e8ce
Reports root/ big
OK: 4622 / Failed: 0 / User-skipped: 91 / Auto-skipped: 0

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mssql_mnesia_25 / odbc_mssql_mnesia / ea8e8ce
Reports root/ big
OK: 4619 / Failed: 0 / User-skipped: 94 / Auto-skipped: 0

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mysql_redis_25 / mysql_redis / ea8e8ce
Reports root/ big
OK: 4602 / Failed: 0 / User-skipped: 111 / Auto-skipped: 0

[NelsonVides]

LGTM 🔥