Move much of the logging out of the driver

[MartinquaXD]

Useful refactoring for step 8 of #337

Settlement submission has a lot of subtleties and currently involves a huge amount of logging and metrics. Ideally the new driver would do that exactly as the current one and to not introduce bugs by poorly copying bits and pieces I refactored the current logging logic into the DriverLogger. I also made submit_settlement() a free function which only needs a SolutionSubmitter and a DriverLogger to handle the submission, logging and metrics.
That allows me to simply re-use that component in the new driver resulting in the identical behavior.

The refactor moves a bunch of code so to help with the review I made small commits which all compiled without any clippy warnings. So I would suggest reviewing those commits individually and in order.

To be perfectly honest this refactor feels a bit shoehorned but I think it's a reasonable step to untangle the current driver and hopefully move to greener pastures in the new driver.

Test Plan

CI

[vkgnosis]

I think it's a good cleanup, definitely while the driver code is in flux. I don't know if we want to follow this pattern of moving all log functions out forever but it is helpful now.

[nlordell]

Feels a bit shoe-horned, but very useful for the refactor.