Built-in MySQL client with `Bun.sql`

[Electroid]

Bun has a built-in Postgres client with Bun.sql. We also want it to support MySQL.

Jarred has already done some of the initial work here:

• Builtin MySQL client #15274

[Jarred-Sumner]

Builtin MySQL client will be part of the Bun v1.2.21 release, thanks to @cirospaciari in #21968