MDEV-31121: ANALYZE statement produces 0 for all timings in embedded server

Timers require my_timer_init() call.
It was made only in mysqld_main(). Call it also from init_embedded_server().

libmysqld/lib_sql.cc

@@ -565,6 +565,8 @@ int init_embedded_server(int argc, char **argv, char **groups)
   if (ho_error != 0)
     return 1;
 
+  my_timer_init(&sys_timer_info);
+
   if (init_common_variables())
   {
     mysql_server_end();

mysql-test/main/analyze_format_json_emb.result

+#
+# MDEV-31121: ANALYZE statement produces 0 for all timings in embedded serve
+#
+create table t1 (a int);
+insert into t1 values (0),(0);
+set @js='$out';
+set @out=(select json_extract(@js,'$**.query_block.r_total_time_ms'));
+select cast(json_extract(@out,'$[0]') as DOUBLE) > 0;
+cast(json_extract(@out,'$[0]') as DOUBLE) > 0
+1
+drop table t1;

mysql-test/main/analyze_format_json_emb.test

+--source include/is_embedded.inc
+--source include/big_test.inc
+
+--echo #
+--echo # MDEV-31121: ANALYZE statement produces 0 for all timings in embedded serve
+--echo #
+create table t1 (a int);
+insert into t1 values (0),(0);
+let $out=`
+analyze format=json select sleep(1+a) from t1
+`;
+
+evalp set @js='$out';
+set @out=(select json_extract(@js,'$**.query_block.r_total_time_ms'));
+select cast(json_extract(@out,'$[0]') as DOUBLE) > 0;
+
+drop table t1;
+