fix: show default value in help output if available

[snitin315]

What kind of change does this PR introduce?
fix

Did you add tests for your changes?
Manual testing
If relevant, did you update the documentation?

Summary
show default value in help output if provided in the option object.

Does this PR introduce a breaking change?
None

Other information
No

[codecov]

Codecov Report

Merging #2814 (2c60e03) into master (0fa5b70) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2814      +/-   ##
==========================================
+ Coverage   93.99%   94.11%   +0.11%     
==========================================
  Files          32       32              
  Lines        1715     1715              
  Branches      495      495              
==========================================
+ Hits         1612     1614       +2     
+ Misses        103      101       -2     

Impacted Files	Coverage Δ
packages/webpack-cli/lib/webpack-cli.js	96.87% <100.00%> (+0.10%)	⬆️
packages/generators/src/addon-generator.ts	91.93% <0.00%> (+1.61%)	⬆️

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[evenstensberg]

is there tests for this?

[snitin315]

None at present. I will see if I can add one.

[alexander-akait]

@snitin315 yep, let's add test, we can do it in api directory of tests

[alexander-akait]

@snitin315 friendly ping