Add `is_convertible_without_narrowing` #228

Job	Run time
changes	6s
[C++26] MSVC 2026 (Debug) / Dependencies	33s
[C++23] MSVC 2026 (Release) / Dependencies	35s
[C++23] Clang 21 (Release) / Dependencies	41s
[C++23] GCC 14 (Debug) / Dependencies	19s
[C++26] GCC 14 (Debug) / Dependencies	20s
[C++23] MSVC 2022 (Debug) / Dependencies	52s
[C++23] Clang 21 (Debug) / Dependencies	33s
[C++23] MSVC 2026 (Debug) / Dependencies	39s
[C++26] GCC 14 (Release) / Dependencies	24s
[C++23] GCC 14 (Release) / Dependencies	24s
[C++26] MSVC 2022 (Debug) / Dependencies	41s
[C++23] MSVC 2022 (Release) / Dependencies	35s
[C++26] Clang 21 (Release) / Dependencies	38s
[C++26] Clang 21 (Debug) / Dependencies	35s
[C++26] MSVC 2022 (Release) / Dependencies	43s
[C++26] MSVC 2026 (Release) / Dependencies	32s
[C++23] GCC 14 (Debug) / iris	37s
[C++26] GCC 14 (Debug) / iris	36s
[C++26] GCC 14 (Release) / iris	41s
[C++23] GCC 14 (Release) / iris	41s
[C++26] MSVC 2026 (Release) / iris	1m 22s
[C++26] MSVC 2026 (Debug) / iris	1m 29s
[C++23] Clang 21 (Debug) / iris	50s
[C++26] Clang 21 (Debug) / iris	43s
[C++23] MSVC 2022 (Release) / iris	1m 21s
[C++23] MSVC 2026 (Release) / iris	1m 26s
[C++26] Clang 21 (Release) / iris	44s
[C++23] MSVC 2026 (Debug) / iris	1m 28s
[C++23] Clang 21 (Release) / iris	45s
[C++26] MSVC 2022 (Debug) / iris	1m 29s
[C++26] MSVC 2022 (Release) / iris	1m 31s
[C++23] MSVC 2022 (Debug) / iris	1m 25s
run-notifier	-1s
	26m 17s

Provide feedback