feat(module:tree-select): add nzSearchFunc input function #8707 #3478

[yjq635]

to specify search logic, such as matching against custom data

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
• 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
• No

Other information

[zorro-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.89%. Comparing base (9607e11) to head (03db60c).

Files with missing lines	Patch %	Lines
components/tree-select/tree-select.component.ts	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8951      +/-   ##
==========================================
- Coverage   91.91%   91.89%   -0.02%     
==========================================
  Files         555      555              
  Lines       19708    19711       +3     
  Branches     2943     2945       +2     
==========================================
  Hits        18114    18114              
- Misses       1268     1269       +1     
- Partials      326      328       +2     

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