insert-performance: add support for batch queries
insert-performance: add support for batch queries

simong/node-cassandra-native-driver,jut-io/node-cassandra-native-driver,simong/node-cassandra-native-driver,jut-io/node-cassandra-native-driver,jut-io/node-cassandra-native-driver,simong/node-cassandra-native-driver,simong/node-cassandra-native-driver,jut-io/node-cassandra-native-driver