Housekeeping

• I am a maintainer of dbt-core

Short description

The BaseRunner class is largely untyped. Given the prevalence of this class, not having it typed could mean that there are potential edge cases and/or runtime exceptions we are not aware of. By typing this class, we give ourselves a lot more guarantees

Acceptance criteria

The BaseRunner class is fully typed

Suggested Tests

N/A

Impact to Other Teams

None

Will backports be required?

No

Context

I'm doing this as an example case for the Tech Improvement Tuesday we're having focused on typing improvements.