Add native FSDP2 module and import migration#46706
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Move FSDP2 wrapping and plan verification to distributed/fsdp.py, keep integrations/fsdp.py as a backward-compatible re-export, and update core call sites to import from transformers.distributed.fsdp.
3outeille
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Summary
src/transformers/distributed/fsdp.pywith FSDP2 wrapping (apply_fully_shard_data_parallel), plan expansion/verification, and FSDP1/2 detectionintegrations/fsdp.pyas a backward-compatible re-export shimaccelerate.py,trainer.py,trainer_seq2seq.py, andgeneration/utils.pyis_fsdp_enabled,is_fsdp_managed_module,verify_fsdp_planfromtransformers.distributedtests/test_distributed_fsdp.pyStacks on: #46705