embed int8 quantization

[nihui]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 89.98%. Comparing base (70310e9) to head (03a186c).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/layer/embed.cpp	91.66%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5667       +/-   ##
===========================================
- Coverage   94.58%   89.98%    -4.60%     
===========================================
  Files         787      264      -523     
  Lines      248626    77271   -171355     
===========================================
- Hits       235164    69536   -165628     
+ Misses      13462     7735     -5727     

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