Switched implementation of P0315Visitor from std::variant to compile-time based approach.

[andreasfertig]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.10%. Comparing base (c91665f) to head (04d77d2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #720      +/-   ##
==========================================
+ Coverage   97.08%   97.10%   +0.01%     
==========================================
  Files          22       22              
  Lines        6732     6731       -1     
==========================================
  Hits         6536     6536              
+ Misses        196      195       -1     

Flag	Coverage Δ
insights-macos	95.99% <100.00%> (+0.01%)	⬆️
insights-ubuntu-amd64-libcxx-No	98.18% <100.00%> (ø)
insights-ubuntu-amd64-libcxx-Yes	98.17% <100.00%> (ø)
insights-ubuntu-arm64-libcxx-No	98.18% <100.00%> (ø)
insights-ubuntu-arm64-libcxx-Yes	98.16% <100.00%> (ø)

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