fix(module:tree): read initial state of nzNodes

[rajniszp]

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?

Node state (isExpanded, isSelected, isChecked, isHalfChecked, isMatched) is ignored when updating nodes/loading children

Issue Number: N/A

What is the new behavior?

Node state is correctly set and thus represented on the UI

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.21%. Comparing base (4eb7420) to head (50fd439).
⚠️ Report is 260 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9380      +/-   ##
==========================================
- Coverage   92.27%   90.21%   -2.07%     
==========================================
  Files         560      573      +13     
  Lines       19708    23711    +4003     
  Branches     3025     4791    +1766     
==========================================
+ Hits        18185    21390    +3205     
- Misses       1191     1503     +312     
- Partials      332      818     +486     

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[Nicoss54]

Could you had some test please

[rajniszp]

Added tests analogous to existing ones
(failed CodeFactor check highlights lines that I did not change)

[rajniszp]

Hi, any chance to merge?