fix(llvm): charconv on apple

[eseiler]

This is a nasty workaround. Ideally, there should be a seqan::stl::from_chars.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.75%. Comparing base (983dc3d) to head (d6ce31a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   94.70%   94.75%   +0.05%     
==========================================
  Files          20       20              
  Lines        1717     1717              
  Branches       47       46       -1     
==========================================
+ Hits         1626     1627       +1     
+ Misses         91       90       -1     

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[seqan-actions]

Documentation preview available at https://docs.seqan.de/preview/seqan/sharg-parser/304