Add GPU support for SYCL platforms

[mborland]

Tested via the Intel SYCL compiler like we do with Boost.Math

[cppalliance-bot]

An automated preview of the documentation is available at https://305.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.

2026-07-09 14:16:39 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.87%. Comparing base (5cb1d94) to head (efa3268).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #305   +/-   ##
========================================
  Coverage    94.87%   94.87%           
========================================
  Files           75       75           
  Lines         9039     9039           
========================================
  Hits          8576     8576           
  Misses         463      463           

Files with missing lines	Coverage Δ
...de/boost/charconv/detail/to_chars_integer_impl.hpp	96.89% <ø> (ø)

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