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 92.27%. Comparing base (4eb7420) to head (a2e23a1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9380   +/-   ##
=======================================
  Coverage   92.27%   92.27%           
=======================================
  Files         560      560           
  Lines       19708    19715    +7     
  Branches     3025     3028    +3     
=======================================
+ Hits        18185    18192    +7     
  Misses       1191     1191           
  Partials      332      332           

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[Nicoss54]

Could you had some test please