Plaid Sync bank transfer events

`/bank_transfer/event/sync` allows you to request up to the next 25 Plaid-initiated bank transfer events that happened after a specific `event_id`. When using Auth with micro-deposit verification enabled, this endpoint can be used to fetch status updates on ACH micro-deposits. For more details, see [micro-deposit events](https://www.plaid.com/docs/auth/coverage/microdeposit-events/).