refactor: do not use webpack directly

[alexander-akait]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

no need, existing

Motivation / Use-Case

Do not use webpack directly, because on the top can exists webpack v4 and it will break logic

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #3414 (15b1286) into master (1b0f514) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3414      +/-   ##
==========================================
+ Coverage   95.10%   95.24%   +0.14%     
==========================================
  Files          34       34              
  Lines        1327     1326       -1     
  Branches      390      392       +2     
==========================================
+ Hits         1262     1263       +1     
+ Misses         61       59       -2     
  Partials        4        4              

Impacted Files	Coverage Δ
lib/Server.js	95.01% <100.00%> (+0.39%)	⬆️
lib/utils/DevServerPlugin.js	97.19% <100.00%> (-0.03%)	⬇️

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