Add cohort preserving from_chars

[mborland]

Closes: #1153

[cppalliance-bot]

An automated preview of the documentation is available at https://1160.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

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

2025-10-23 11:52:35 UTC

[codecov]

Codecov Report

❌ Patch coverage is 98.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.4%. Comparing base (c24dd80) to head (c7ee8b9).
⚠️ Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/decimal/charconv.hpp	93.4%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1160     +/-   ##
=========================================
+ Coverage     99.4%   99.4%   +0.1%     
=========================================
  Files          254     254             
  Lines        17395   17446     +51     
  Branches      1891    1897      +6     
=========================================
+ Hits         17274   17326     +52     
+ Misses         121     120      -1     

Files with missing lines	Coverage Δ
include/boost/decimal/detail/parser.hpp	95.9% <100.0%> (ø)
test/test_charconv_preservation.cpp	100.0% <100.0%> (ø)
test/test_string_construction.cpp	100.0% <100.0%> (ø)
include/boost/decimal/charconv.hpp	97.6% <93.4%> (+0.3%)	⬆️

... and 1 file with indirect coverage changes

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