naumix

Add Bigger, Regularized, Optimistic (BRO)

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Addition of the BRO algorithm (https://arxiv.org/abs/2405.16158) ## Description ## Motivation and Context - [ ] I have raised an issue to propose this change ([required](https://github.com/DLR-RM/stable-baselines3/blob/master/CONTRIBUTING.md) for new features and bug...