please add java api cli to generate model archiver mar file or tell the generate logic

[mullerhai]

🚀 The feature

HI,
now we use Javacpp pytorch jar package could write and training pytorch model the same with python ,so we don't want to use python code to write python handler.py to generate mar file .please add the java api cli o generate model archiver mar file or tell the generate logic ，
thanks

Motivation, pitch

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Alternatives

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Additional context

No response