fix: cssModulesTypescriptLoader.mode should be optional

[jiyingzhi]

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• fix: cssModulesTypescriptLoader.mode should be optional
• close [Bug] cssModulesTypescriptLoader 的类型定义和文档描述不符 #5678

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View rendered docs/docs/cli.md
View rendered docs/docs/cli.zh-CN.md

[codecov]

Codecov Report

Merging #5917 (fcc0f0c) into master (0a80342) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5917   +/-   ##
=======================================
  Coverage   83.37%   83.37%           
=======================================
  Files         155      155           
  Lines        3465     3465           
  Branches      934      914   -20     
=======================================
  Hits         2889     2889           
  Misses        568      568           
  Partials        8        8           

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