Create a New Grant User on AWS RDS (MariaDB)

Today, I've played with AWS RDS with MariaDB. In the normally, AWS is created just one user for access AWS RDS. Here is the steps for create a new grant user on AWS RDS with MariaDB.mysql> GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, PROCESS, REFERENCES, INDEX, ALTER, SHOW DATABASES, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, BINLOG MONITOR, CREATE VIEW, S...