Add PaymentProcessorBatchSettlement support for PG.

Currently we are setting PaymentProcessorBatchSettlement = true for AUTH_CAPTURE and CAPTURE since this is the last point of communication between YC and PG.

This means that we can never VOID_CAPTURE as we assume that for all payments made funds are received.

We need to add new payment gateway feature: supportsBatchSettlementNotification and add additional callback filter to set this flag on payments properly