Better exception if `DELIMITER` is used

[bgrainger]

If a client tries to use DELIMITER in their SQL script, it'll fail:

• Support for delimiter statement #645
• Delimitter issue #692
• mysqlconnector using it to upload SQL procedure scripts to Mariadb or MYSQL #1009
• "delimiter" is not supported #1017

MySqlConnector could detect this scenario (in the exception handler after it fails? or when parsing the SQL upfront?) and throw a more informative exception with a link to a documentation page explaining what to do instead.