feat: `abs(quantity)` exposed for conforming freestanding implementat… #1857

Job	Run time
Generate build matrix for CMake Test Package CI	5s
Apple Clang 15 C++20 fmtlib gsl-lite Debug	1m 10s
Apple Clang 15 C++20 fmtlib none Release	1m 14s
Clang-16 (x86-64) C++20 fmtlib gsl-lite Debug	1m 6s
Clang-16 (x86-64) C++20 fmtlib none Release	1m 7s
Clang-17 (x86-64) C++20 fmtlib none Debug	1m 11s
Clang-17 (x86-64) C++20 std::format gsl-lite Debug	1m 18s
Clang-18 (arm64) C++20 std::format gsl-lite Debug	1m 32s
Clang-18 (arm64) C++23 fmtlib none Release	1m 29s
Clang-18 (x86-64) C++20 std::format gsl-lite Debug	1m 21s
Clang-18 (x86-64) C++23 std::format none Debug	1m 47s
GCC-12 C++20 fmtlib gsl-lite Debug	47s
GCC-12 C++20 fmtlib ms-gsl Release	41s
GCC-12 C++23 fmtlib ms-gsl Debug	44s
GCC-13 C++20 std::format gsl-lite Debug	40s
GCC-13 C++20 std::format none Release	39s
GCC-14 C++20 fmtlib none Release	36s
GCC-14 C++20 std::format gsl-lite Debug	29s
MSVC 14.4 C++20 fmtlib gsl-lite Debug	1m 33s
MSVC 14.4 C++20 std::format gsl-lite Debug	1m 38s
	21m 7s

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