feat(mysql): implementing mysql in wasip2

[asteurer]

This is almost finished; however, I could use some help figuring out how to implement the driver.NamedValueChecker method on the stmt struct. The comments on the interface indicate that it's supposed to help the driver handle types beyond the default Value types; however, I'm not clear on which additional types need to be converted?

closes #30

[asteurer]

I decided to just leave out the driver.NamedValueChecker for now. Not quite sure why the example won't build, though.

[itowlson]

Is it possible it's an interface version issue? Should it be fermyon:spin/[email protected]? The pre-versioning interface is in the WITs, but I'm not sure if it gets pulled into the package. (Guessing though.)

Comparison: MySQL (error) vs MQTT (works I believe): extra v2.0.0 in import path:

[asteurer]

@itowlson That did the trick! Thank you. This is ready for review. Please note that the example has been updated to include use of the db.Exec method.

[adamreese]

Looking great! Can you add a package doc string like you did for redis?

[adamreese]

Thanks Andrew!