[feat] security raw query type scan and validate

[JimmyDaddy]

eg.

realm.query(`SELECT * FROM users WHERE id = 1; DELETE FROM users`);

[Chen Yangjian]

querying multiple statements is disabled by default if mysqljs/mysql is used https://github.com/mysqljs/mysql#multiple-statement-queries

IMHO, possible causes of such queries might be like below:

realm.query(`SELECT * FROM users WHERE id = ${ctx.query.id}`);

which can be checked in advance by enforcing some lint rules. Otherwise, to eliminate such problem thoroughly, we might need to check the raw sql before sending it to database. Would that be a bit too much?