[FEATURE]: mysql2 wait_timeout in createConnection

### Describe what you want

Allow to set the wait_timeout for new mysql connections in drizzle. https://confluence.atlassian.com/stashkb/connection-timeout-with-mysql-database-297676189.html#:~:text=MySQL%20has%20its%20wait_timeout%20variable,connection%20before%20Stash%20does%20it.

I'm having issues related with this timeout, I'm using the same instance of mysql for all application but when the database stays without requests in the last 8 hours the connection is closed.

Start by tracing the MySQL adapter's mysql2 createConnection path and compare its current connection options with MySQL's wait_timeout behavior described in the linked reference. Done means wait_timeout can be configured for newly created connections and the behavior is covered by an appropriate test; the issue names no source file or test, so locate those entry points first.

Written by the indexing model from the issue text.