Add a script for loading the test dataset into Kairos

[taewhi]

We need to load our test datasets into Kairos for regression tests.
The following MySQL loading script can be referred.

https://github.com/traindb-project/traindb/blob/main/traindb-core/src/test/resources/datasets/instacart_small/load_mysql.sql

[taewhi]

You can find how to run SQL regression tests:
https://traindb-project.github.io/traindb-doc/ko/dev_guide/SQL_REG_TEST.html