Anonymous auth supports mnesia and cets backends

[NelsonVides]

MIM-2066
ejabberd_auth_anonymous has now two backends, mnesia and cets, which can be configured.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (c858cec) 83.82% compared to head (6c27108) 84.04%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4148      +/-   ##
==========================================
+ Coverage   83.82%   84.04%   +0.21%     
==========================================
  Files         561      564       +3     
  Lines       34053    34083      +30     
==========================================
+ Hits        28546    28645      +99     
+ Misses       5507     5438      -69     

Files	Coverage Δ
src/auth/ejabberd_auth_anonymous_backend.erl	90.90% <90.90%> (ø)
src/auth/ejabberd_auth_anonymous_mnesia.erl	87.50% <87.50%> (ø)
src/auth/ejabberd_auth_anonymous.erl	64.91% <75.00%> (-3.95%)	⬇️
src/auth/ejabberd_auth_anonymous_cets.erl	73.33% <73.33%> (ø)

... and 17 files with indirect coverage changes

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[mongoose-im]

elasticsearch_and_cassandra_26 / elasticsearch_and_cassandra_mnesia / 6c27108
Reports root/ big
OK: 369 / Failed: 0 / User-skipped: 38 / Auto-skipped: 0

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small_tests_25 / small_tests / 6c27108
Reports root / small

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small_tests_26 / small_tests / 6c27108
Reports root / small

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small_tests_26_arm64 / small_tests / 6c27108
Reports root / small

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ldap_mnesia_25 / ldap_mnesia / 6c27108
Reports root/ big
OK: 2307 / Failed: 0 / User-skipped: 865 / Auto-skipped: 0

---

ldap_mnesia_26 / ldap_mnesia / 6c27108
Reports root/ big
OK: 2307 / Failed: 0 / User-skipped: 865 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_26 / mysql_redis / 6c27108
Reports root/ big
OK: 4240 / Failed: 0 / User-skipped: 144 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / 6c27108
Reports root/ big
OK: 4272 / Failed: 0 / User-skipped: 112 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_26 / pgsql_mnesia / 6c27108
Reports root/ big
OK: 4272 / Failed: 0 / User-skipped: 112 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_26 / odbc_mssql_mnesia / 6c27108
Reports root/ big
OK: 4269 / Failed: 0 / User-skipped: 115 / Auto-skipped: 0

---

mysql_redis_26 / mysql_redis / 6c27108
Reports root/ big
OK: 4641 / Failed: 0 / User-skipped: 139 / Auto-skipped: 0

---

internal_mnesia_26 / internal_mnesia / 6c27108
Reports root/ big
OK: 2457 / Failed: 0 / User-skipped: 715 / Auto-skipped: 0

---

pgsql_mnesia_25 / pgsql_mnesia / 6c27108
Reports root/ big
OK: 4661 / Failed: 0 / User-skipped: 119 / Auto-skipped: 0

---

pgsql_cets_26 / pgsql_cets / 6c27108
Reports root/ big
OK: 4659 / Failed: 0 / User-skipped: 121 / Auto-skipped: 0

---

pgsql_mnesia_26 / pgsql_mnesia / 6c27108
Reports root/ big
OK: 4661 / Failed: 0 / User-skipped: 119 / Auto-skipped: 0

---

mssql_mnesia_26 / odbc_mssql_mnesia / 6c27108
Reports root/ big
OK: 4658 / Failed: 0 / User-skipped: 122 / Auto-skipped: 0

[arcusfelis]

ok

[DenysGonchar]

looks good