docs: provide an example of adding a custom file loader configuration

[Jinbao1001]

provide an example of adding a custom file loader configuration in chainwebpack

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Name	Status	Preview	Comments	Updated (UTC)
umi	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 11, 2024 7:49am

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 28.47%. Comparing base (0694d3a) to head (ad90906). Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12180      +/-   ##
==========================================
- Coverage   28.48%   28.47%   -0.01%     
==========================================
  Files         492      492              
  Lines       15119    15123       +4     
  Branches     3601     3605       +4     
==========================================
  Hits         4306     4306              
- Misses      10041    10047       +6     
+ Partials      772      770       -2     

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[fz6m]

关于自定义 loader ，可以参考下 #12222 。