Mariadb default character set

- Mariadb default character set utf8
- Mariadb change default character set
- Mariadb get default character set
- Mariadb 10.6 default character set
- Mariadb binlog unknown variable default character set utf8mb4
- Mariadb use utf8 as default server's character set
- Mariadb show default character set
- Mariadb check default character set