refactor: `convertible_impl` refactored to `convertible` + results ca… #1967

Job	Run time
Generate build matrix for Conan CI	4s
Apple Clang 15 C++20 fmtlib gsl-lite Debug	2h 19m 5s
Apple Clang 15 C++20 fmtlib none Release	1h 54m 8s
Clang-16 (x86-64) C++20 fmtlib gsl-lite Debug	5m 27s
Clang-16 (x86-64) C++20 fmtlib none Release	6m 25s
Clang-17 (x86-64) C++20 fmtlib none Debug	6m 38s
Clang-17 (x86-64) C++20 std::format gsl-lite Debug	6m 39s
Clang-18 (arm64) C++20 std::format gsl-lite Debug	2m 53s
Clang-18 (arm64) C++23 fmtlib none Release	3m 11s
Clang-18 (x86-64) C++20 std::format gsl-lite Debug	6m 54s
Clang-18 (x86-64) C++23 std::format none Debug	6m 48s
GCC-12 C++20 fmtlib gsl-lite Debug	4m 42s
GCC-12 C++20 fmtlib ms-gsl Release	6m 32s
GCC-12 C++23 fmtlib ms-gsl Debug	4m 39s
GCC-13 C++20 std::format gsl-lite Debug	3m 53s
GCC-13 C++20 std::format none Release	4m 3s
GCC-14 C++20 fmtlib none Release	3m 52s
GCC-14 C++20 std::format gsl-lite Debug	3m 48s
MSVC 14.4 C++20 fmtlib gsl-lite Debug	2m 9s
MSVC 14.4 C++20 std::format gsl-lite Debug	2m 31s
Promote Conan package	2m 20s
	5h 36m 41s

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