Use mysql2 to fix mysql connection issue for mysql 8

[zhengcan]

Currently, the server component use mysql package.
It doesn't support MySQL 8 as server side.

Migrate to mysql2 will fix related issues: #1782 .

[HenryHengZJ]

@zhengcan thanks! some minor linting issue and lock file conflict

[HenryHengZJ]

sorry @zhengcan there was a conflict with lock file, if you can resolve that'd be great, otherwise you can grant access for me to push to your branch i can resolve the conflict

[zhengcan]

sorry @zhengcan there was a conflict with lock file, if you can resolve that'd be great, otherwise you can grant access for me to push to your branch i can resolve the conflict

I've merged source branch to the PR.
Please check it as your need.

[HenryHengZJ]

thank you @zhengcan !!