Provide overloads to specify MySql schema to use in extensions

[mgkeen]

When multiple schemas existed, it checked for any table named schemaversions in any schema.
Query code was already in place to be specific about schema, but not exposed via extensions.

[chriswithpants]

Build failed 😞

[mgkeen]

Build failure appears to be because i added to the public API and it needs approval. Don't want to go and change the "approved" file myself. I assume @JakeGinnivan needs to do this?

[JakeGinnivan]

@mgkeen you can approve no worries.

The check is there so if you change the public API you can visualise that change and make sure it is not a breaking change.

[JakeGinnivan]

This change is just adding overloads, so it's fine to accept the change because there are no breaking changes.

[mgkeen]

Updated. Really like that way of visualising API changes. Been looking for something that simple.

[JakeGinnivan]

https://github.com/JakeGinnivan/ApiApprover is the project :)