Utilize MySQL 8 RENAME TABLE supporting locks

[shlomi-noach]

MySQL 8 (as of 8.0.13) introduced a change where RENAME TABLE is possible while holding a WRITE LOCK. This has been targeted specifically for gh-ost. See https://dev.mysql.com/doc/refman/8.0/en/rename-table.html and https://mysqlserverteam.com/the-mysql-8-0-13-maintenance-release-is-generally-available/

gh-ost should utilize this new feature on >= 8.0.13.

This will potentialy solve #687

[breisig]

We are using MySQL 8.0.15 and is essential to get fixed and released.

[shlomi-noach]

According to my tests gh-ost supports MySQL 8.0.16 and 8.0.18, so I'm closing this issue.