Add helpers for modular arithmetic #315

Job	Run time
std::format none C++20 Clang-18 Release	8m 38s
std::format none C++20 Clang-18 Debug	8m 16s
std::format none C++23 Clang-18 Release	8m 9s
std::format none C++23 Clang-18 Debug	8m 12s
std::format gsl-lite C++20 Clang-18 Release	8m 22s
std::format gsl-lite C++20 Clang-18 Debug	8m 18s
std::format gsl-lite C++23 Clang-18 Release	8m 8s
std::format gsl-lite C++23 Clang-18 Debug	8m 5s
std::format ms-gsl C++20 Clang-18 Release	8m 23s
std::format ms-gsl C++20 Clang-18 Debug	8m 1s
std::format ms-gsl C++23 Clang-18 Release	8m 30s
std::format ms-gsl C++23 Clang-18 Debug	8m 8s
fmtlib none C++20 Clang-18 Release	8m 24s
fmtlib none C++20 Clang-18 Debug	7m 59s
fmtlib none C++23 Clang-18 Release	8m 0s
fmtlib none C++23 Clang-18 Debug	9m 37s
fmtlib gsl-lite C++20 Clang-18 Release	8m 17s
fmtlib gsl-lite C++20 Clang-18 Debug	8m 18s
fmtlib gsl-lite C++23 Clang-18 Release	8m 22s
fmtlib gsl-lite C++23 Clang-18 Debug	8m 19s
fmtlib ms-gsl C++20 Clang-18 Release	9m 40s
fmtlib ms-gsl C++20 Clang-18 Debug	8m 17s
fmtlib ms-gsl C++23 Clang-18 Release	8m 5s
fmtlib ms-gsl C++23 Clang-18 Debug	8m 14s
	3h 20m 42s

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