feat: `abs(quantity)` exposed for conforming freestanding implementat… #2016

Job	Run time
Generate build matrix for Conan CI	2s
Apple Clang 15 C++20 fmtlib gsl-lite Debug	1m 53s
Apple Clang 15 C++20 fmtlib none Release	3m 2s
Clang-16 (x86-64) C++20 fmtlib gsl-lite Debug	5m 37s
Clang-16 (x86-64) C++20 fmtlib none Release	6m 13s
Clang-17 (x86-64) C++20 fmtlib none Debug	6m 45s
Clang-17 (x86-64) C++20 std::format gsl-lite Debug	8m 30s
Clang-18 (arm64) C++20 std::format gsl-lite Debug	3m 29s
Clang-18 (arm64) C++23 fmtlib none Release	5m 24s
Clang-18 (x86-64) C++20 std::format gsl-lite Debug	7m 25s
Clang-18 (x86-64) C++23 std::format none Debug	6m 38s
GCC-12 C++20 fmtlib gsl-lite Debug	6m 30s
GCC-12 C++20 fmtlib ms-gsl Release	5m 17s
GCC-12 C++23 fmtlib ms-gsl Debug	5m 34s
GCC-13 C++20 std::format gsl-lite Debug	4m 39s
GCC-13 C++20 std::format none Release	4m 35s
GCC-14 C++20 fmtlib none Release	3m 57s
GCC-14 C++20 std::format gsl-lite Debug	3m 51s
MSVC 14.4 C++20 fmtlib gsl-lite Debug	2m 6s
MSVC 14.4 C++20 std::format gsl-lite Debug	1m 22s
Promote Conan package	0s
	1h 32m 49s

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