feat: chainWebpack config support async

[sorrycc]

Checklist

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

Description of change

• any feature?
• close [Feature Request] 配置 chainWebpack 项支持异步函数 #4336

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

[codecov]

Codecov Report

Merging #4344 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4344   +/-   ##
=======================================
  Coverage   82.89%   82.89%           
=======================================
  Files         138      138           
  Lines        2719     2719           
  Branches      671      671           
=======================================
  Hits         2254     2254           
  Misses        457      457           
  Partials        8        8           

Impacted Files	Coverage Δ
...ackages/bundler-webpack/src/getConfig/getConfig.ts	94.73% <100.00%> (ø)

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