refactor: improvements in `are_ingredients_convertible` #88

Job	Run time
std::format none C++23 GCC-14 Release	1m 53s
std::format none C++23 GCC-14 Debug	2m 2s
std::format none C++23 Clang-18 Release	52s
fmtlib none C++23 GCC-14 Release	1m 48s
fmtlib none C++23 GCC-14 Debug	1m 56s
fmtlib none C++23 Clang-18 Release	41s
	9m 12s

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