feat: Treeview

[cansuaa]

Description

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

Attention: Patch coverage is 29.62963% with 57 lines in your changes missing coverage. Please review.

Project coverage is 96.25%. Comparing base (9080ab6) to head (1863bbe).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/treeview/treeitem.tsx	10.00%	27 Missing ⚠️
src/test-utils/dom/treeview/index.ts	26.08%	17 Missing ⚠️
...internal/components/expand-toggle-button/index.tsx	0.00%	6 Missing ⚠️
src/treeview/utils.ts	0.00%	6 Missing ⚠️
src/treeview/internal.tsx	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3477      +/-   ##
==========================================
- Coverage   96.49%   96.25%   -0.24%     
==========================================
  Files         806      811       +5     
  Lines       23092    23142      +50     
  Branches     7574     7590      +16     
==========================================
- Hits        22283    22276       -7     
- Misses        802      859      +57     
  Partials        7        7              

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