[CONJS-313] permit using question mark parameters even when using namedPlaceholders option - Jira

for mysql2 compatibility, permits the use of question mark parameters even when setting `namedPlaceholders` option.

example :

    await conn.query('CREATE TABLE namedPlaceholders1(t varchar(128))');

    await conn.query("INSERT INTO `namedPlaceholders1` value ('a'), ('b'), ('c')");

    // permit use of placeholder

    let res = await conn.query('select * from `namedPlaceholders1` where t IN (:possible)', { possible: ['a', 'c'] });

    // but standard question mark queries still works

    res = await conn.query('select * from `namedPlaceholders1` where t IN (?)', [['b', 'c']]);

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MariaDB Connector/node.js