feat(module:slider): support nzTooltipVisible

[wzhudev]

close #2373

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)
[x] 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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[netlify]

Deploy preview for ng-zorro-master ready!

Built with commit 6809830

https://deploy-preview-2930--ng-zorro-master.netlify.com

[codecov]

Codecov Report

Merging #2930 into master will increase coverage by 0.02%.
The diff coverage is 93.05%.

@@            Coverage Diff             @@
##           master    #2930      +/-   ##
==========================================
+ Coverage   97.36%   97.39%   +0.02%     
==========================================
  Files         524      525       +1     
  Lines       11042    11011      -31     
  Branches      782      788       +6     
==========================================
- Hits        10751    10724      -27     
+ Misses        190      185       -5     
- Partials      101      102       +1

Impacted Files	Coverage Δ
components/core/util/getMentions.ts	60% <ø> (ø)	⬆️
components/slider/nz-slider.module.ts	100% <ø> (ø)	⬆️
components/core/util/check.ts	91.17% <ø> (ø)	⬆️
components/slider/nz-slider-track.component.ts	100% <100%> (ø)	⬆️
components/timeline/nz-timeline.component.ts	97.87% <100%> (ø)	⬆️
components/core/util/number.ts	100% <100%> (ø)
components/cascader/nz-cascader.component.ts	99.22% <100%> (ø)	⬆️
components/core/util/array.ts	100% <100%> (ø)	⬆️
components/slider/nz-slider-definitions.ts	100% <100%> (ø)
components/slider/nz-slider-handle.component.ts	100% <100%> (ø)	⬆️
... and 12 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f2fde8c...6809830. Read the comment docs.

[vthinkxie]

缺少拖拽时的border样式