Allow manual execution of migrations

[occash]

I’d like to have more control over how and when database migrations are executed.

Currently, migrations run automatically when a connection is created. However, in some cases I need to:

• Run migrations manually at a specific time.
• Include custom business logic within migrations that can only be done in Swift code.

It would be great to have an API similar to GRDB (with an upTo argument in the migrate() function) or SQLDelight (newVersion and callback arguments), where migrations can be run step-by-step.

[wickwirew]

Can definitely add this! Have it working locally now. Will try to PR it tomorrow as I'm not thrilled on my implementation and want to take a second look with a fresh set of eyes.

Thanks for all the feedback though! The other two issues are simple additions and can definitely get them in as well

[occash]

Thanks for the quick response! Appreciate your work on this - really like the project.