refactor: `get_complexity` refactored to returned maximum complexity … #268

Job	Run time
std::format none C++23 GCC-14 Release	1m 22s
std::format none C++23 GCC-14 Debug	1m 32s
std::format none C++23 Clang-18 Release	2m 15s
fmtlib none C++23 GCC-14 Release	1m 26s
fmtlib none C++23 GCC-14 Debug	1m 30s
fmtlib none C++23 Clang-18 Release	2m 0s
	10m 5s

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