Add low_cpu_mem_usage option to from_single_file to align with from_pretrained (#12114)
* align meta device of from_single_file with from_pretrained
* update docstr
* Apply style fixes
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Co-authored-by: IrisRainbowNeko <rainbow-neko@outlook.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>