kerr: add two new errors

For new requests, unused in clients

pkg/kerr/kerr.go

@@ -180,6 +180,8 @@ var (
  InconsistentClusterID = &Error{"INCONSISTENT_CLUSTER_ID", 104, false, "The clusterId in the request does not match that found on the server."}
  TransactionalIDNotFound = &Error{"TRANSACTIONAL_ID_NOT_FOUND", 105, false, "The transactionalId could not be found."}
  FetchSessionTopicIDError = &Error{"FETCH_SESSION_TOPIC_ID_ERROR", 106, true, "The fetch session encountered inconsistent topic ID usage."}
+ IneligibleReplica = &Error{"INELIGIBLE_REPLICA", 107, false, "The new ISR contains at least one ineligible replica."}
+ NewLeaderElected = &Error{"NEW_LEADER_ELECTED", 108, false, "The AlterPartition request successfully updated the partition state but the leader has changed."}
 )
 
 var code2err = map[int16]error{