feat(module:tree-view): upgrade tree view

[WwwHhhYran]

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?

Upgrade Tree View Component

angular/cdk has now marked treeControl as deprecated in 18.2.0, replacing it with levelAccessor and childrenAccessor, and is planning to remove treeControl in 21.0.0. So I'm going to synchronise this feature in Ng Zorro.

So I've made the following changes:

• Deprecate nzTreeControl parameter and add nzLevelAccessor and nzChildrenAccessor paramter, in order to synchronize the new features of CdkTree (@angular/cdk ^18.2.0)
• Rewrite all demos for Tree View component based on levelAccessor and childrenAccessor.
• Update document

Does this PR introduce a breaking change?

• Yes
• No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 8 lines in your changes missing coverage. Please review.

Project coverage is 92.00%. Comparing base (2d9ff5f) to head (9c549c0).

Files with missing lines	Patch %	Lines
components/tree-view/indent.ts	81.81%	0 Missing and 6 partials ⚠️
components/tree-view/flattener.ts	97.36%	0 Missing and 1 partial ⚠️
components/tree-view/tree-virtual-scroll-view.ts	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9003      +/-   ##
==========================================
+ Coverage   91.94%   92.00%   +0.06%     
==========================================
  Files         559      575      +16     
  Lines       19769    20261     +492     
  Branches     3050     3122      +72     
==========================================
+ Hits        18176    18642     +466     
- Misses       1266     1279      +13     
- Partials      327      340      +13     

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[WwwHhhYran]

There has been a lack of testing for Tree-View component for a long time, and this is a historical problem. I will add test cases to make up for it in the future. （ WIP...