feat: support download modal from modelscope #399
      
        
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I am a developer from ModelScope, the largest open-source model community in China. This library is exceptional, particularly in the realm of RAG, aiding individuals in document parsing. I have introduced a new feature that allows automatically downloading models from ModelScope by simply setting an environment variable
UNSTRUCTURED_USE_MODELSCOPE=true. This is crucial for developers in China and other countries, enabling them to focus on utilizing the tool. Thank you!