Add benchmark files and documentation for CUDA on Device vs Host Performance

[mborland]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://295.charconv.prtest.cppalliance.org/libs/charconv/doc/html/index.html

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

2026-03-31 15:20:58 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.86%. Comparing base (d7bae92) to head (b7dee45).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #295   +/-   ##
========================================
  Coverage    94.86%   94.86%           
========================================
  Files           74       74           
  Lines         9009     9009           
========================================
  Hits          8546     8546           
  Misses         463      463           

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