permit returning all Bulk insert id's

When using batch to bulk insert, gaps in AUTO_INCREMENT IDs are created when reaching 50+ inserts even with innodb_autoinc_lock_mode set to 1 (consecutive)

The mySQL, documentation says :

With innodb_autoinc_lock_mode set to 0 (“traditional”) or 1 (“consecutive”), the auto-increment values generated by any given statement are consecutive, without gaps, because the table-level AUTO-INC lock is held until the end of the statement, and only one such statement can execute at a time.

So I'm not sure that's intended. Due to the fact that insertId, only return one ID, i think it's very important to not have gaps in IDs so we can deduce inserted ones.

From https://github.com/mariadb-corporation/mariadb-connector-nodejs/issues/263