feat(sdk): add external_modules option to save_model

[bojiang]

TODO:

• [ ] doc
• [ ] tests

[codecov[bot]]

Codecov Report

Merging #2895 (ddcb764) into main (ddcb764) will not change coverage. The diff coverage is n/a.

:exclamation: Current head ddcb764 differs from pull request most recent head 4b9b1ce. Consider uploading reports for the commit 4b9b1ce to get more accurate results

@@           Coverage Diff           @@
##             main    #2895   +/-   ##
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  Coverage   70.54%   70.54%           
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  Files         104      104           
  Lines        9497     9497           
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  Hits         6700     6700           
  Misses       2797     2797           

[aarnphm]

@bojiang can you fetch main and run the test again?

[bojiang]

rebased to the main