refactor: binary operators of `quantity` and `quantity_point` are now… #8

Job	Run time
std::format none C++20 Clang-18 Release	4m 57s
std::format none C++20 Clang-18 Debug	4m 24s
std::format none C++23 Clang-18 Release	4m 42s
std::format none C++23 Clang-18 Debug	4m 53s
std::format gsl-lite C++20 Clang-18 Release	4m 52s
std::format gsl-lite C++20 Clang-18 Debug	4m 28s
std::format gsl-lite C++23 Clang-18 Release	4m 49s
std::format gsl-lite C++23 Clang-18 Debug	4m 28s
std::format ms-gsl C++20 Clang-18 Release	4m 47s
std::format ms-gsl C++20 Clang-18 Debug	4m 31s
std::format ms-gsl C++23 Clang-18 Release	4m 56s
std::format ms-gsl C++23 Clang-18 Debug	4m 36s
fmtlib none C++20 Clang-18 Release	4m 47s
fmtlib none C++20 Clang-18 Debug	4m 32s
fmtlib none C++23 Clang-18 Release	4m 48s
fmtlib none C++23 Clang-18 Debug	4m 23s
fmtlib gsl-lite C++20 Clang-18 Release	4m 52s
fmtlib gsl-lite C++20 Clang-18 Debug	4m 35s
fmtlib gsl-lite C++23 Clang-18 Release	4m 50s
fmtlib gsl-lite C++23 Clang-18 Debug	4m 35s
fmtlib ms-gsl C++20 Clang-18 Release	5m 1s
fmtlib ms-gsl C++20 Clang-18 Debug	4m 46s
fmtlib ms-gsl C++23 Clang-18 Release	4m 47s
fmtlib ms-gsl C++23 Clang-18 Debug	4m 39s
	1h 52m 58s

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