Default charset utf8mb4 collate utf8mb4_general_ci

- Engine innodb default charset utf8mb4 collate utf8mb4_general_ci
- Default charset and setting in current installation db_charset utf8mb4 db_collate utf8mb4_general_ci
- Default charset=utf8mb4 collate=utf8mb4_0900_ai_ci
- Default charset=utf8 collate=utf8_unicode_ci
- Default charset=utf8mb4
- Default charset=utf8mb3
- Default character set utf8mb4 collate 'utf8mb4_unicode_ci'