feat: negation requirement added to `Representation` concepts #297

Job	Run time
std::format none C++20 Clang-18 Release	7m 50s
std::format none C++20 Clang-18 Debug	7m 26s
std::format none C++23 Clang-18 Release	7m 43s
std::format none C++23 Clang-18 Debug	5m 56s
std::format gsl-lite C++20 Clang-18 Release	7m 41s
std::format gsl-lite C++20 Clang-18 Debug	7m 18s
std::format gsl-lite C++23 Clang-18 Release	7m 21s
std::format gsl-lite C++23 Clang-18 Debug	7m 3s
std::format ms-gsl C++20 Clang-18 Release	8m 19s
std::format ms-gsl C++20 Clang-18 Debug	7m 13s
std::format ms-gsl C++23 Clang-18 Release	7m 39s
std::format ms-gsl C++23 Clang-18 Debug	7m 11s
fmtlib none C++20 Clang-18 Release	7m 44s
fmtlib none C++20 Clang-18 Debug	7m 25s
fmtlib none C++23 Clang-18 Release	7m 29s
fmtlib none C++23 Clang-18 Debug	7m 3s
fmtlib gsl-lite C++20 Clang-18 Release	7m 41s
fmtlib gsl-lite C++20 Clang-18 Debug	8m 54s
fmtlib gsl-lite C++23 Clang-18 Release	8m 15s
fmtlib gsl-lite C++23 Clang-18 Debug	7m 12s
fmtlib ms-gsl C++20 Clang-18 Release	7m 39s
fmtlib ms-gsl C++20 Clang-18 Debug	7m 26s
fmtlib ms-gsl C++23 Clang-18 Release	7m 43s
fmtlib ms-gsl C++23 Clang-18 Debug	7m 11s
	3h 0m 22s

Provide feedback