refactor(embedding): level up embed method to top API add docs

[hanxiao]

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[codecov]

Codecov Report

Merging #178 (67eff3d) into main (df19264) will increase coverage by 0.01%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   86.19%   86.20%   +0.01%     
==========================================
  Files          25       25              
  Lines        1210     1211       +1     
==========================================
+ Hits         1043     1044       +1     
  Misses        167      167              

Flag	Coverage Δ
finetuner	86.20% <40.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
finetuner/labeler/executor.py	0.00% <0.00%> (ø)
finetuner/__init__.py	73.33% <100.00%> (+0.91%)	⬆️
finetuner/embedding.py	100.00% <100.00%> (ø)

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