feat(comp: tree,tree-select,pro-tree): add getNode method (#910)

[tuchg]

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Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

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What kind of change does this PR introduce?

• Bugfix
• Feature
• Component style update
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
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[codecov]

Codecov Report

Merging #916 (ea1b8f8) into main (fff5022) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head ea1b8f8 differs from pull request most recent head 3abde54. Consider uploading reports for the commit 3abde54 to get more accurate results

@@           Coverage Diff           @@
##             main     #916   +/-   ##
=======================================
  Coverage   93.38%   93.38%           
=======================================
  Files         679      679           
  Lines       66569    66648   +79     
  Branches     5875     5878    +3     
=======================================
+ Hits        62163    62242   +79     
  Misses       4406     4406           

Impacted Files	Coverage Δ
...omponents/tree-select/__tests__/treeSelect.spec.ts	97.55% <100.00%> (+0.05%)	⬆️
packages/components/tree-select/src/TreeSelect.tsx	95.54% <100.00%> (+0.02%)	⬆️
packages/components/tree-select/src/types.ts	99.37% <100.00%> (+0.02%)	⬆️
packages/components/tree/__tests__/tree.spec.ts	100.00% <100.00%> (ø)
packages/components/tree/src/Tree.tsx	98.10% <100.00%> (+0.10%)	⬆️
packages/components/tree/src/types.ts	99.48% <100.00%> (+0.01%)	⬆️
packages/pro/tree/__tests__/proTree.spec.ts	100.00% <100.00%> (ø)
packages/pro/tree/src/ProTree.tsx	94.53% <100.00%> (+0.03%)	⬆️
packages/pro/tree/src/types.ts	100.00% <100.00%> (ø)

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