Feat: Speculatice Decoding export with quantization support

[h-guo18]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.10%. Comparing base (eb99488) to head (33689a4).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #913      +/-   ##
==========================================
- Coverage   73.47%   73.10%   -0.37%     
==========================================
  Files         205      205              
  Lines       22032    22281     +249     
==========================================
+ Hits        16187    16288     +101     
- Misses       5845     5993     +148     

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