feat: support worker-loader with config workerLoader

[sorrycc]

Checklist

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

Description of change

• any feature?
• close [Bug] worker-loader cannot work with umi@3.4.0 #6247

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View rendered docs/config/README.md
View rendered docs/config/README.zh-CN.md

[codecov]

Codecov Report

Merging #6253 (7f21183) into master (906363c) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6253      +/-   ##
==========================================
+ Coverage   84.45%   84.48%   +0.02%     
==========================================
  Files         154      155       +1     
  Lines        3507     3513       +6     
  Branches      952      953       +1     
==========================================
+ Hits         2962     2968       +6     
  Misses        535      535              
  Partials       10       10              

Impacted Files	Coverage Δ
packages/preset-built-in/src/index.ts	100.00% <ø> (ø)
...ackages/bundler-webpack/src/getConfig/getConfig.ts	85.00% <100.00%> (+0.18%)	⬆️
...eset-built-in/src/plugins/features/workerLoader.ts	100.00% <100.00%> (ø)

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