Add `is_convertible_without_narrowing` #219

Job	Run time
changes	5s
[C++26] MSVC 2026 (Release) / Dependencies	1m 51s
[C++26] GCC 14 (Release) / Dependencies	1m 40s
[C++26] GCC 14 (Debug) / Dependencies	1m 39s
[C++23] MSVC 2022 (Debug) / Dependencies	1m 47s
[C++26] MSVC 2022 (Release) / Dependencies	2m 9s
[C++26] Clang 21 (Release) / Dependencies	1m 53s
[C++26] MSVC 2022 (Debug) / Dependencies	1m 50s
[C++23] MSVC 2022 (Release) / Dependencies	1m 52s
[C++23] MSVC 2026 (Release) / Dependencies	2m 8s
[C++23] MSVC 2026 (Debug) / Dependencies	2m 6s
[C++23] Clang 21 (Release) / Dependencies	1m 47s
[C++26] Clang 21 (Debug) / Dependencies	1m 57s
[C++23] Clang 21 (Debug) / Dependencies	1m 32s
[C++23] GCC 14 (Release) / Dependencies	1m 33s
[C++26] MSVC 2026 (Debug) / Dependencies	1m 46s
[C++23] GCC 14 (Debug) / Dependencies	1m 14s
[C++23] GCC 14 (Debug) / iris	1m 3s
[C++23] Clang 21 (Debug) / iris	1m 5s
[C++23] GCC 14 (Release) / iris	1m 14s
[C++26] GCC 14 (Release) / iris	1m 16s
[C++26] GCC 14 (Debug) / iris	1m 1s
[C++26] MSVC 2026 (Debug) / iris	1m 39s
[C++23] Clang 21 (Release) / iris	1m 32s
[C++23] MSVC 2022 (Debug) / iris	1m 47s
[C++26] MSVC 2022 (Debug) / iris	1m 45s
[C++26] MSVC 2026 (Release) / iris	1m 52s
[C++23] MSVC 2022 (Release) / iris	1m 42s
[C++26] Clang 21 (Release) / iris	1m 37s
[C++26] Clang 21 (Debug) / iris	1m 19s
[C++23] MSVC 2026 (Debug) / iris	1m 31s
[C++23] MSVC 2026 (Release) / iris	1m 48s
[C++26] MSVC 2022 (Release) / iris	2m 23s
run-notifier	0s
	53m 23s

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