fix: make webpack optional peerDep

[hardfist]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• documentation update
• typo fix
• metadata update

Motivation / Use-Case

same as webpack/webpack-dev-server#4778

Breaking Changes

No

Additional Info

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6b9dd74) 97.34% compared to head (0d826d3) 97.34%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1488   +/-   ##
=======================================
  Coverage   97.34%   97.34%           
=======================================
  Files           9        9           
  Lines         377      377           
  Branches      112      112           
=======================================
  Hits          367      367           
  Misses          9        9           
  Partials        1        1           

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