feat: webpack factory

[njugray]

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

Affected plugin(s)

• webpack

Description of change

support config factory

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@1524f36). Click here to learn what that means.
The diff coverage is 89.65%.

@@           Coverage Diff            @@
##             master    #130   +/-   ##
========================================
  Coverage          ?   91.3%           
========================================
  Files             ?      75           
  Lines             ?    1311           
  Branches          ?       0           
========================================
  Hits              ?    1197           
  Misses            ?     114           
  Partials          ?       0

Impacted Files	Coverage Δ
packages/beidou-webpack/lib/factory/plugin.js	100% <100%> (ø)
packages/beidou-webpack/lib/factory/webpack.js	95.2% <88%> (ø)

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