Add UTF string library #209

Job	Run time
changes	6s
[C++23] MSVC 2026 (Release) / Dependencies	37s
[C++26] GCC 14 (Release) / Dependencies	18s
[C++26] GCC 14 (Debug) / Dependencies	19s
[C++23] GCC 14 (Release) / Dependencies	20s
[C++26] MSVC 2022 (Release) / Dependencies	41s
[C++23] GCC 14 (Debug) / Dependencies	24s
[C++23] Clang 21 (Debug) / Dependencies	34s
[C++26] Clang 21 (Debug) / Dependencies	33s
[C++26] MSVC 2022 (Debug) / Dependencies	55s
[C++23] MSVC 2022 (Release) / Dependencies	38s
[C++23] MSVC 2022 (Debug) / Dependencies	37s
[C++26] Clang 21 (Release) / Dependencies	35s
[C++23] Clang 21 (Release) / Dependencies	33s
[C++23] MSVC 2026 (Debug) / Dependencies	48s
[C++26] MSVC 2026 (Release) / Dependencies	36s
[C++26] MSVC 2026 (Debug) / Dependencies	36s
[C++26] GCC 14 (Release) / iris	1m 5s
[C++26] GCC 14 (Debug) / iris	1m 2s
[C++23] GCC 14 (Release) / iris	1m 15s
[C++23] GCC 14 (Debug) / iris	53s
[C++23] Clang 21 (Release) / iris	1m 38s
[C++26] Clang 21 (Debug) / iris	59s
[C++23] Clang 21 (Debug) / iris	1m 8s
[C++26] Clang 21 (Release) / iris	1m 30s
[C++26] MSVC 2026 (Release) / iris	1m 53s
[C++26] MSVC 2026 (Debug) / iris	1m 53s
[C++23] MSVC 2026 (Release) / iris	1m 48s
[C++23] MSVC 2022 (Debug) / iris	2m 52s
[C++23] MSVC 2022 (Release) / iris	1m 48s
[C++26] MSVC 2022 (Release) / iris	1m 51s
[C++23] MSVC 2026 (Debug) / iris	1m 42s
[C++26] MSVC 2022 (Debug) / iris	1m 44s
run-notifier	-1s
	34m 10s

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