Update stat and domain categories

[chrzaszcz]

Use singular nouns for all category names

Motivation:

• Conflict of the new 'stats' category with the old 'stats' command in CLI.
• Consistency - there is 'metric', 'vcard', 'stanza' etc.

Tests CLI for statistics as well.

Note: I found that there are no tests for error handling in the stat category. It's not urgent, so I am not fixing it here.

[mongoose-im]

small_tests_24 / small_tests / ae96db7
Reports root / small

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small_tests_25 / small_tests / ae96db7
Reports root / small

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dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / ae96db7
Reports root/ big
OK: 3325 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

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ldap_mnesia_24 / ldap_mnesia / ae96db7
Reports root/ big
OK: 1895 / Failed: 0 / User-skipped: 500 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / ae96db7
Reports root/ big
OK: 3325 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

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dynamic_domains_mysql_redis_25 / mysql_redis / ae96db7
Reports root/ big
OK: 3308 / Failed: 0 / User-skipped: 105 / Auto-skipped: 0

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ldap_mnesia_25 / ldap_mnesia / ae96db7
Reports root/ big
OK: 1895 / Failed: 0 / User-skipped: 500 / Auto-skipped: 0

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dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / ae96db7
Reports root/ big
OK: 3325 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

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pgsql_mnesia_24 / pgsql_mnesia / ae96db7
Reports root/ big
OK: 3699 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

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internal_mnesia_25 / internal_mnesia / ae96db7
Reports root/ big
OK: 2016 / Failed: 0 / User-skipped: 379 / Auto-skipped: 0

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elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / ae96db7
Reports root/ big
OK: 2312 / Failed: 0 / User-skipped: 374 / Auto-skipped: 0

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pgsql_mnesia_25 / pgsql_mnesia / ae96db7
Reports root/ big
OK: 3699 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

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mysql_redis_25 / mysql_redis / ae96db7
Reports root/ big
OK: 3694 / Failed: 0 / User-skipped: 102 / Auto-skipped: 0

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mssql_mnesia_25 / odbc_mssql_mnesia / ae96db7
Reports root/ big
OK: 3699 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

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riak_mnesia_24 / riak_mnesia / ae96db7
Reports root/ big
OK: 2173 / Failed: 0 / User-skipped: 367 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #3715 (ae96db7) into feature/graphql-cli (c8d1e9d) will increase coverage by 20.79%.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##           feature/graphql-cli    #3715       +/-   ##
========================================================
+ Coverage                61.43%   82.22%   +20.79%     
========================================================
  Files                      520      520               
  Lines                    33769    33769               
========================================================
+ Hits                     20745    27767     +7022     
+ Misses                   13024     6002     -7022     

Impacted Files	Coverage Δ
.../graphql/admin/mongoose_graphql_admin_mutation.erl	100.00% <ø> (+23.07%)	⬆️
src/graphql/admin/mongoose_graphql_admin_query.erl	100.00% <ø> (+21.42%)	⬆️
src/mod_muc_log.erl	62.82% <0.00%> (+0.26%)	⬆️
src/ejabberd_ctl.erl	24.18% <0.00%> (+0.29%)	⬆️
src/pubsub/node_flat.erl	74.70% <0.00%> (+0.39%)	⬆️
src/privacy/mod_privacy.erl	85.77% <0.00%> (+0.41%)	⬆️
src/mod_caps.erl	75.34% <0.00%> (+0.46%)	⬆️
src/muc_light/mod_muc_light_codec_modern.erl	89.94% <0.00%> (+0.52%)	⬆️
src/pubsub/mod_pubsub.erl	73.42% <0.00%> (+0.67%)	⬆️
src/muc_light/mod_muc_light_utils.erl	92.00% <0.00%> (+1.00%)	⬆️
... and 224 more

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[JanuszJakubiec]

looks good