Implementing the new P4O algorithm in cleanRL

[AndikanAffiah]

I would love to see the P4O being implemented in cleanRL
The paper authors claim a 2.9× increase in
performance with the inclusion of predictive processing, while requiring 22% fewer parameters.
reference: https://arxiv.org/abs/2211.06236

And a possible combination with the new xLSTM that has improved performance compared to prevous implementations of LSTM
reference: https://arxiv.org/pdf/2405.04517
@vwxyzjn