Async save state_dict to file

[zkh2016]

Pull Request Template

Issue Reference

Please mention the issue number if applicable, or write "N/A" if it's a new feature.

将save的内存到文件过程异步处理，减少训练等待存文件的时间。

Issue #...

Description

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Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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Checklist

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• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Additional Information

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