bank: factor accumulation out to helper on TotalAccountsStats

[t-nelson]

Problem

account stats accumulation into TotalAccountsStats is performed in a method on Bank with an inconvenient interface

Summary of Changes

move accumulation logic out to a helper on TotalAccountStats to ease reuse

[brooksprumo]

Lgtm

I'm assuming you already have a usage for this refactoring as well; can you point me to it?

[t-nelson]

Lgtm

I'm assuming you already have a usage for this refactoring as well; can you point me to it?

yep. top commit here #28461. i'm cutting out the account collection step in favor of directly accumulating/outputting during the accounts scan, so no iterator to pass in