Tree select update

[JackYumg]

PR Checklist

Please check if your PR fulfills the following requirements:

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

tree-select add status and placement

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot[bot]]

This preview will be available after the AzureCI is passed.

[codecov[bot]]

Codecov Report

Merging #7460 (9cb6fe3) into master (da3005d) will decrease coverage by 0.04%. The diff coverage is 69.23%.

@@            Coverage Diff             @@
##           master    #7460      +/-   ##
==========================================
- Coverage   91.55%   91.51%   -0.05%     
==========================================
  Files         496      496              
  Lines       16297    16321      +24     
  Branches     2529     2530       +1     
==========================================
+ Hits        14921    14936      +15     
- Misses       1051     1058       +7     
- Partials      325      327       +2     

Impacted Files	Coverage Δ
components/tree-select/tree-select.component.ts	88.62% <69.23%> (-2.29%)	:arrow_down:
components/tabs/tab-nav-bar.component.ts	87.23% <0.00%> (-0.71%)	:arrow_down:
components/core/util/text-measure.ts	92.98% <0.00%> (+0.87%)	:arrow_up:

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