fix(ai-statistics): adjust requestBodyBufferLimit

[HecarimV]

Ⅰ. Describe what this PR did

ai-statistics插件修改RequestBodyBufferLimit

Ⅱ. Does this pull request fix one issue?

fix #2188

[CH3CHO]

建议加个配置项，不然你配多大都可能会遇到比这个还大的 body。

当然终极解决方案是改成流式解析。

[HecarimV]

建议加个配置项，不然你配多大都可能会遇到比这个还大的 body。

当然终极解决方案是改成流式解析。

我看ai-proxy配的这么大，100 MB应该够大了吧

[CH3CHO]

建议加个配置项，不然你配多大都可能会遇到比这个还大的 body。
当然终极解决方案是改成流式解析。

我看ai-proxy配的这么大，100 MB应该够大了吧

好吧，那也不是不行。

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.73%. Comparing base (ef31e09) to head (67fb867).
Report is 495 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2192      +/-   ##
==========================================
+ Coverage   35.91%   45.73%   +9.82%     
==========================================
  Files          69       79      +10     
  Lines       11576    12895    +1319     
==========================================
+ Hits         4157     5897    +1740     
+ Misses       7104     6651     -453     
- Partials      315      347      +32     

see 77 files with indirect coverage changes

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