Add `is_convertible_without_narrowing` #220

Job	Run time
changes	5s
[C++23] MSVC 2022 (Debug) / Dependencies	41s
[C++26] MSVC 2022 (Release) / Dependencies	41s
[C++23] GCC 14 (Debug) / Dependencies	26s
[C++26] GCC 14 (Release) / Dependencies	49s
[C++26] Clang 21 (Debug) / Dependencies	32s
[C++23] MSVC 2022 (Release) / Dependencies	36s
[C++26] MSVC 2026 (Release) / Dependencies	34s
[C++23] MSVC 2026 (Release) / Dependencies	33s
[C++26] MSVC 2026 (Debug) / Dependencies	37s
[C++23] MSVC 2026 (Debug) / Dependencies	49s
[C++26] GCC 14 (Debug) / Dependencies	20s
[C++26] Clang 21 (Release) / Dependencies	32s
[C++23] Clang 21 (Release) / Dependencies	37s
[C++23] Clang 21 (Debug) / Dependencies	31s
[C++23] GCC 14 (Release) / Dependencies	17s
[C++26] MSVC 2022 (Debug) / Dependencies	45s
[C++23] GCC 14 (Release) / iris	1m 11s
[C++26] GCC 14 (Debug) / iris	57s
[C++23] GCC 14 (Debug) / iris	57s
[C++23] Clang 21 (Debug) / iris	1m 7s
[C++26] Clang 21 (Release) / iris	1m 38s
[C++26] Clang 21 (Debug) / iris	1m 12s
[C++23] MSVC 2026 (Release) / iris	2m 37s
[C++26] MSVC 2026 (Release) / iris	2m 19s
[C++23] MSVC 2022 (Release) / iris	2m 7s
[C++23] Clang 21 (Release) / iris	1m 49s
[C++26] MSVC 2026 (Debug) / iris	1m 46s
[C++23] MSVC 2022 (Debug) / iris	1m 41s
[C++26] MSVC 2022 (Release) / iris	2m 28s
[C++26] MSVC 2022 (Debug) / iris	2m 35s
[C++26] GCC 14 (Release) / iris	1m 12s
[C++23] MSVC 2026 (Debug) / iris	1m 46s
run-notifier	16s
	37m 3s

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