VelocityApprover needs to persist state

[Evanfeenstra]

not the policy state, but the actual history of payments in the current interval.

There are some notes about it in the VLS comments in VelocityApprover

We need to persist it on our end

[Evanfeenstra]

Also, updating the ValidatorFactory policy also needs to update the VelocityApprover with the same params