MDEV-9077 - port sys schema to MariaDB

- Innodb is not always available, which means t is not always
possible to use innodb system variables, or innodb information schema
tables.

Thus creation of objects that use Innodb information_schema is enclosed
into BEGIN NOT ATOMIC blocks with dummy SQLEXCEPTION handler.

- sys_config table uses Aria, just like other system tables.

- several tables that exist in MySQL, do not exist in MariaDB
   performance_schema.replication_applier_status, mysql.slave_master_info,
   mysql.slave_relay_log_info

scripts/sys_schema/functions/sys_get_config.sql

@@ -83,9 +83,13 @@ CREATE DEFINER='root'@'localhost' FUNCTION sys_get_config (
     READS SQL DATA
 BEGIN
     DECLARE v_value VARCHAR(128) DEFAULT NULL;
+    DECLARE old_val INTEGER DEFAULT NULL;
+    SET old_val = @@session.sql_notes;
+    SET SESSION sql_notes=0;
 
     -- Check if we have the variable in the sys.sys_config table
     SET v_value = (SELECT value FROM sys.sys_config WHERE variable = in_variable_name);
+    SET SESSION sql_notes=old_val;
   
     -- Protection against the variable not existing in sys_config
     IF (v_value IS NULL) THEN