feat(module:time-picker): support borderless

[TheBeard30]

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
[x] 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
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #7389

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #7547 (a2b4167) into master (64b7389) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head a2b4167 differs from pull request most recent head 395a708. Consider uploading reports for the commit 395a708 to get more accurate results

@@           Coverage Diff           @@
##           master    #7547   +/-   ##
=======================================
  Coverage   91.75%   91.75%           
=======================================
  Files         502      502           
  Lines       16699    16700    +1     
  Branches     2604     2604           
=======================================
+ Hits        15322    15323    +1     
  Misses       1047     1047           
  Partials      330      330           

Impacted Files	Coverage Δ
components/time-picker/time-picker.component.ts	90.86% <100.00%> (+0.04%)	⬆️

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[wenqi73]

LGTM