Add UTF string library #206

Job	Run time
changes	4s
[C++26] Clang 21 (Release) / Dependencies	31s
[C++26] Clang 21 (Debug) / Dependencies	36s
[C++23] MSVC 2022 (Debug) / Dependencies	34s
[C++23] Clang 21 (Release) / Dependencies	27s
[C++26] MSVC 2026 (Release) / Dependencies	35s
[C++26] GCC 14 (Debug) / Dependencies	23s
[C++23] Clang 21 (Debug) / Dependencies	34s
[C++26] MSVC 2022 (Release) / Dependencies	42s
[C++26] MSVC 2022 (Debug) / Dependencies	43s
[C++23] MSVC 2026 (Release) / Dependencies	33s
[C++23] GCC 14 (Debug) / Dependencies	19s
[C++23] GCC 14 (Release) / Dependencies	18s
[C++23] MSVC 2022 (Release) / Dependencies	1m 20s
[C++26] GCC 14 (Release) / Dependencies	16s
[C++23] MSVC 2026 (Debug) / Dependencies	35s
[C++26] MSVC 2026 (Debug) / Dependencies	36s
[C++26] GCC 14 (Release) / iris	1m 10s
[C++23] GCC 14 (Release) / iris	1m 9s
[C++23] GCC 14 (Debug) / iris	53s
[C++26] GCC 14 (Debug) / iris	53s
[C++23] Clang 21 (Release) / iris	1m 34s
[C++26] Clang 21 (Release) / iris	1m 34s
[C++23] MSVC 2026 (Release) / iris	1m 41s
[C++23] Clang 21 (Debug) / iris	1m 7s
[C++23] MSVC 2022 (Debug) / iris	1m 41s
[C++23] MSVC 2026 (Debug) / iris	1m 49s
[C++26] MSVC 2026 (Release) / iris	2m 33s
[C++26] MSVC 2026 (Debug) / iris	1m 43s
[C++26] Clang 21 (Debug) / iris	1m 3s
[C++26] MSVC 2022 (Debug) / iris	1m 50s
[C++26] MSVC 2022 (Release) / iris	1m 54s
[C++23] MSVC 2022 (Release) / iris	1m 40s
run-notifier	18s
	33m 38s

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