[Feature Request] expunge-by-transaction

[bapcltd-marv]

Is your feature request related to a problem? Please describe.
unit tests may cause emails to not be removed

Describe the solution you'd like
Mailbox::expungeTransaction(Closure(Mailbox, & list<int>) : T): T

Mailbox::expungeTransaction(static function(Mailbox $mailbox, & list<int> $to_delete) : T {
// do something
$to_delete[] = $a;

// do something that might throw
$to_delete[] = $b;

// do something else that might throw
$to_delete[] = $c;
});

Describe alternatives you've considered
manually wrapping code in try-catch blocks is cumbersome.

Additional context
https://github.com/paragonie/easydb/blob/38cfac4bbd96960628ca3237ed98f3f344ffdd7b/src/EasyDB.php#L1249