feat(module:tabs): add router exact active parameter

[wzhudev]

close #3858

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: #3858

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[netlify]

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Built with commit f2b4a06

https://deploy-preview-3862--ng-zorro-master.netlify.com

[codecov]

Codecov Report

Merging #3862 into master will decrease coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3862      +/-   ##
==========================================
- Coverage   95.36%   95.24%   -0.13%     
==========================================
  Files         723      726       +3     
  Lines       14722    14668      -54     
  Branches     1937     1910      -27     
==========================================
- Hits        14040    13970      -70     
- Misses        249      260      +11     
- Partials      433      438       +5

Impacted Files	Coverage Δ
components/tabs/nz-tabset.component.ts	93.19% <100%> (ø)	⬆️
components/form/nz-form-item.component.ts	86.84% <0%> (-10.04%)	⬇️
components/tooltip/nz-tooltip.component.ts	88.88% <0%> (-1.59%)	⬇️
components/tabs/nz-tabs-nav.component.ts	89.88% <0%> (-1.08%)	⬇️
components/date-picker/header-picker.component.ts	97.05% <0%> (-0.09%)	⬇️
components/back-top/nz-back-top.module.ts	100% <0%> (ø)	⬆️
...te-picker/lib/popups/date-range-popup.component.ts	95.3% <0%> (ø)	⬆️
components/avatar/nz-avatar.module.ts	100% <0%> (ø)	⬆️
components/statistic/nz-statistic.module.ts	100% <0%> (ø)	⬆️
...nents/date-picker/lib/year/year-panel.component.ts	98.3% <0%> (ø)	⬆️
... and 55 more

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[vthinkxie]

Docs markdown error

[vthinkxie]

LGTM