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a2071a18 - [LoRA] introduce `LoraBaseMixin` to promote reusability. (#8670)

[LoRA] introduce `LoraBaseMixin` to promote reusability. (#8670) * introduce to promote reusability. * up * add more tests * up * remove comments. * fix fuse_nan test * clarify the scope of fuse_lora and unfuse_lora * remove space