Add clientId and time parameters to pricing methods

This is a broken-out refactoring from []
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=121603352

javatests/google/registry/flows/domain/DomainTransferFlowTestCase.java

@@ -185,6 +185,7 @@ public class DomainTransferFlowTestCase<F extends Flow, R extends EppResource>
     return createBillingEventForTransfer(
         domain,
         historyEntry,
+        "NewRegistrar",
         TRANSFER_REQUEST_TIME,
         TRANSFER_EXPIRATION_TIME,
         EXTENDED_REGISTRATION_YEARS);