chore(module:carousel): remove vertical api

[wzhudev]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[x] Other... Please describe: remove nzVertical API of carousel component

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Other information

[codecov]

Codecov Report

Merging #4376 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4376      +/-   ##
==========================================
- Coverage   93.23%   93.22%   -0.02%     
==========================================
  Files         519      519              
  Lines       12822    12817       -5     
  Branches     2013     2013              
==========================================
- Hits        11955    11949       -6     
  Misses        452      452              
- Partials      415      416       +1

Impacted Files	Coverage Δ
components/carousel/nz-carousel.component.ts	93.15% <ø> (-0.23%)	⬇️
components/time-picker/time-holder.ts	96.64% <0%> (-0.68%)	⬇️

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