Add debug tool

[RexWzh]

主要更新：

• 修补 chat.save 为空的bug，增加 ensure_ascii=False 字段（by qing25）
• 增加 debug_log 函数，用于排查调用错误（by LuaMarke）
• 添加贡献者列表

[codecov]

Codecov Report

Patch coverage: 72.22% and project coverage change: -0.50 ⚠️

Comparison is base (0692bcd) 83.03% compared to head (a5bd2e8) 82.53%.

❗ Current head a5bd2e8 differs from pull request most recent head dfa7444. Consider uploading reports for the commit dfa7444 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage   83.03%   82.53%   -0.50%     
==========================================
  Files          12       12              
  Lines         448      481      +33     
==========================================
+ Hits          372      397      +25     
- Misses         76       84       +8     

Flag	Coverage Δ
unittests	82.53% <72.22%> (-0.50%)	⬇️

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Impacted Files	Coverage Δ
openai_api_call/__init__.py	73.33% <67.74%> (ø)
openai_api_call/chattool.py	55.08% <100.00%> (ø)
openai_api_call/request.py	87.75% <100.00%> (ø)
tests/test_openai_api_call.py	100.00% <100.00%> (ø)

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[RexWzh]

Check√