feat: peft training for llm embed finetuning

[LongxingTan]

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[codecov]

Codecov Report

Attention: Patch coverage is 48.71795% with 20 lines in your changes missing coverage. Please review.

Project coverage is 50.93%. Comparing base (114f798) to head (6de0ab3).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/retrievals/models/embedding_auto.py	43.33%	17 Missing ⚠️
src/retrievals/trainer/trainer.py	33.33%	2 Missing ⚠️
src/retrievals/models/rerank.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   48.62%   50.93%   +2.30%     
==========================================
  Files          26       26              
  Lines        2225     2252      +27     
==========================================
+ Hits         1082     1147      +65     
+ Misses       1143     1105      -38     

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