[huggingface] Adds more option to convert onnx model

[frankfliu]

• [tokenizer] Refactor djl_convert python code
• [huggingface] Adds more option to convert onnx model

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.65%. Comparing base (5c691c0) to head (33d1be7).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3180      +/-   ##
============================================
+ Coverage     68.41%   71.65%   +3.23%     
- Complexity     7027     7302     +275     
============================================
  Files           697      697              
  Lines         32759    32759              
  Branches       3406     3406              
============================================
+ Hits          22413    23473    +1060     
+ Misses         8737     7684    -1053     
+ Partials       1609     1602       -7     

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