chore(info): rename --additional-package flag to additional-packages

[jamesgeorge007]

What kind of change does this PR introduce?
chore

Did you add tests for your changes?
Update test suite.

If relevant, did you update the documentation?
Yes

Summary
Rename --additional-package to --additional-packages as it supports variadic arguments.

Does this PR introduce a breaking change?
Yes, --additional-package is not recognized anymore.

Other information
N/A

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ James George (b7829bc)

[codecov]

Codecov Report

Merging #3019 (b7829bc) into master (962ab79) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3019      +/-   ##
==========================================
- Coverage   94.89%   94.86%   -0.04%     
==========================================
  Files          22       22              
  Lines        1625     1615      -10     
  Branches      482      480       -2     
==========================================
- Hits         1542     1532      -10     
  Misses         83       83              

Impacted Files	Coverage Δ
packages/info/src/index.ts	100.00% <100.00%> (ø)
packages/webpack-cli/bin/cli.js	85.71% <0.00%> (-4.29%)	⬇️
packages/webpack-cli/lib/webpack-cli.js	95.68% <0.00%> (-0.03%)	⬇️
packages/webpack-cli/lib/bootstrap.js	100.00% <0.00%> (ø)

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[alexander-akait]

Sorry for delay, not sure we need it, because we have --entry=foo.js --entry=bar.js and there are a lot of other options with the same logic in names, so let's keep it as it and avoid breaking changes, I would say that this is our design, sorry for losing your time and feel free to feedback