Add to_wstring function

[mborland]

Closes: #444

[cppalliance-bot]

An automated preview of the documentation is available at https://453.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-07-23 20:10:10 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.29%. Comparing base (420dec9) to head (3710143).
⚠️ Report is 25 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #453   +/-   ##
========================================
  Coverage    96.28%   96.29%           
========================================
  Files           83       83           
  Lines         7268     7280   +12     
  Branches      2560     2570   +10     
========================================
+ Hits          6998     7010   +12     
  Misses          31       31           
  Partials       239      239           

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