function getStmtConfig(stmt) {
    var config = stmt.match(/(question_mark|numbered|named)(?:\((.)\))?/);
    if (!config) config = [null, 'question_mark', undefined];
    return config;
}
Parses the statement configuration
@memberof module:plugins.SqlSupport
@param {string} stmt
@returns {Array} null, mode, option
@private