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58237364 - Add Ascend NPU support for SDXL fine-tuning and fix the model saving bug when using DeepSpeed. (#7816)

Add Ascend NPU support for SDXL fine-tuning and fix the model saving bug when using DeepSpeed. (#7816) * Add Ascend NPU support for SDXL fine-tuning and fix the model saving bug when using DeepSpeed. * fix check code quality * Decouple the NPU flash attention and make it an independent module. * add doc and unit tests for npu flash attention. --------- Co-authored-by: mhh001 <mahonghao1@huawei.com> Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>