[Wise] Create Blazer query for difference in estimated and settled amount over time.

[garyhtou]

We want to track how accurate our estimates are—in case our estimation calculations are incorrect or drift from the settled amount. This may happen if Wise changes its ACH fee.

https://github.com/hackclub/hcb/blob/745a1ad42785ea47aeca92fd971b40084a5bc5fa/app/models/wise_transfer.rb#L217

[garyhtou]

Anyone can take this on— but ask @YodaLightsabr if you have questions