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                                            weikaiwen

[fsdp] feat: integrate PrefixGrouper for GRPO training acceleration

### What does this PR do? Integrate [PrefixGrouper](https://github.com/johncaged/PrefixGrouper) into verl's FSDP worker to accelerate GRPO training by reducing redundant prefix computations. In GRPO training, each prompt is copied `G` times...