refactor(onnx): separate impl

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 14.56693% with 217 lines in your changes missing coverage. Please review.

Project coverage is 71.09%. Comparing base (f6d8a3d) to head (3f48380).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
extensions/impl/onnx/onnx.go	14.57%	209 Missing and 8 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3521   +/-   ##
=======================================
  Coverage   71.09%   71.09%           
=======================================
  Files         416      416           
  Lines       48006    48006           
=======================================
+ Hits        34126    34128    +2     
- Misses      11210    11212    +2     
+ Partials     2670     2666    -4     

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