Wrap sorted literals with black profile settings

[HarperZ9]

Summary

• make literal sorting use vertical-hanging, parenthesized wrapping when the flat sorted assignment exceeds the configured line length
• keep existing pprint output for shorter literals and non-vertical modes
• add regression coverage for # isort: tuple under the Black profile

Closes #1815.

Verification

• uv run pytest tests/unit/test_literal.py -q
• uv run ruff check isort/literal.py tests/unit/test_literal.py
• uv run black --check --fast isort/literal.py tests/unit/test_literal.py
• uv run mypy isort/literal.py

[codecov]

Codecov Report

❌ Patch coverage is 76.31579% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.94%. Comparing base (01adac1) to head (06e2ee3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2573      +/-   ##
==========================================
- Coverage   99.16%   98.94%   -0.22%     
==========================================
  Files          41       41              
  Lines        3101     3129      +28     
  Branches      671      677       +6     
==========================================
+ Hits         3075     3096      +21     
- Misses         14       19       +5     
- Partials       12       14       +2     

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