how to use NstepReplayBuffer or PrioritizedReplayBuffer in version 8.0.0+?

Thanks for your package! It's a very powerful tool to efficiently build a replay buffer in reinforcement algorithms! I have found that you have deleted the class NstepReplayBuffer and PrioritizedReplayBuffer in version 8+ for cpprb, can you tell me how to use these two class in the new version for cpprb? Would you like give me some example codes for that? Thanks a lot!!!