feat: allow entryCodeAhead block to modify pluginArgs

[fxxjdedd]

Checklist

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

Description of change

• any feature?
• close https://github.com/umijs/umi/ISSUE_URL

[fxxjdedd]

related to hmr bug: umijs/plugins#629

[codecov]

Codecov Report

Merging #6702 (bf08be1) into master (da26563) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6702   +/-   ##
=======================================
  Coverage   84.77%   84.77%           
=======================================
  Files         157      157           
  Lines        3599     3599           
  Branches      991      991           
=======================================
  Hits         3051     3051           
  Misses        538      538           
  Partials       10       10           

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