Make MAM return timestamps in microseconds

[NelsonVides]

No need to convert any of these TS to seconds, XMPP admits microseconds just fine, and client devices this way can ensure they'll display the messages in the right order, otherwise there's a risk of messages arriving within the same 1s window and therefore having the same timestamp.

Also, inbox show timestamps in microseconds, so it is just consistent.

[mongoose-im]

small_tests_23 / small_tests / f5038f9
Reports root / small

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small_tests_24 / small_tests / f5038f9
Reports root / small

---

dynamic_domains_pgsql_mnesia_23 / pgsql_mnesia / f5038f9
Reports root/ big
OK: 2822 / Failed: 0 / User-skipped: 133 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / f5038f9
Reports root/ big
OK: 2822 / Failed: 0 / User-skipped: 133 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_24 / mysql_redis / f5038f9
Reports root/ big
OK: 2805 / Failed: 0 / User-skipped: 150 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_24 / odbc_mssql_mnesia / f5038f9
Reports root/ big
OK: 2821 / Failed: 1 / User-skipped: 133 / Auto-skipped: 0

service_domain_db_SUITE:db:db_keeps_syncing_after_cluster_join

{error,{test_case_failed,{[<<"example1.com">>,<<"example2.com">>,
               <<"example3.com">>],
              [<<"example1.com">>,<<"example2.com">>,
               <<"example3.com">>,<<"example4.com">>]}}}

Report log

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ldap_mnesia_24 / ldap_mnesia / f5038f9
Reports root/ big
OK: 1505 / Failed: 0 / User-skipped: 399 / Auto-skipped: 0

---

internal_mnesia_24 / internal_mnesia / f5038f9
Reports root/ big
OK: 1546 / Failed: 0 / User-skipped: 358 / Auto-skipped: 0

---

ldap_mnesia_23 / ldap_mnesia / f5038f9
Reports root/ big
OK: 1505 / Failed: 0 / User-skipped: 399 / Auto-skipped: 0

---

pgsql_mnesia_24 / pgsql_mnesia / f5038f9
Reports root/ big
OK: 3196 / Failed: 0 / User-skipped: 142 / Auto-skipped: 0

---

pgsql_mnesia_23 / pgsql_mnesia / f5038f9
Reports root/ big
OK: 3196 / Failed: 0 / User-skipped: 142 / Auto-skipped: 0

---

elasticsearch_and_cassandra_24 / elasticsearch_and_cassandra_mnesia / f5038f9
Reports root/ big
OK: 1853 / Failed: 0 / User-skipped: 366 / Auto-skipped: 0

---

mysql_redis_24 / mysql_redis / f5038f9
Reports root/ big
OK: 3191 / Failed: 0 / User-skipped: 147 / Auto-skipped: 0

---

mssql_mnesia_24 / odbc_mssql_mnesia / f5038f9
Reports root/ big
OK: 3196 / Failed: 0 / User-skipped: 142 / Auto-skipped: 0

---

riak_mnesia_24 / riak_mnesia / f5038f9
Reports root/ big
OK: 1696 / Failed: 0 / User-skipped: 365 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_24 / odbc_mssql_mnesia / f5038f9
Reports root/ big
OK: 2822 / Failed: 0 / User-skipped: 133 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #3595 (f5038f9) into master (33d44ca) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3595   +/-   ##
=======================================
  Coverage   80.86%   80.86%           
=======================================
  Files         426      426           
  Lines       32379    32378    -1     
=======================================
+ Hits        26182    26183    +1     
+ Misses       6197     6195    -2     

Impacted Files	Coverage Δ
src/mam/mod_mam.erl	88.40% <100.00%> (-0.05%)	⬇️
src/mam/mod_mam_muc.erl	74.76% <100.00%> (ø)
src/mongoose_tcp_listener.erl	76.59% <0.00%> (-4.26%)	⬇️
...bal_distrib/mod_global_distrib_hosts_refresher.erl	71.69% <0.00%> (-1.89%)	⬇️
src/inbox/mod_inbox_rdbms_async.erl	65.51% <0.00%> (-1.73%)	⬇️
src/mod_muc_log.erl	63.21% <0.00%> (ø)
src/pubsub/mod_pubsub.erl	73.19% <0.00%> (+0.05%)	⬆️
src/offline/mod_offline.erl	77.17% <0.00%> (+1.08%)	⬆️
...rc/smart_markers/mod_smart_markers_rdbms_async.erl	88.88% <0.00%> (+3.70%)	⬆️
..._distrib/mod_global_distrib_outgoing_conns_sup.erl	88.00% <0.00%> (+8.00%)	⬆️

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[chrzaszcz]

Looks good 👍