winit-uikit: implement UITextInput so multi-stage IMEs (CJK pinyin/kana/hangul) work #8939

Job	Run time
Taplo	6s
Minimize JavaScript	9s
Run cargo-deny	26s
Check formatting	14s
ESLint	19s
Check for typos	7s
Test stable Windows 32bit GNU	2m 46s
Test nightly Windows 32bit MSVC	1m 53s
Test stable Windows 64bit MSVC	1m 50s
Test stable Windows 64bit GNU	2m 21s
Test stable Linux 32bit	2m 57s
Test stable Windows 32bit MSVC	2m 25s
Test stable macOS Aarch64	1m 54s
Test stable Redox OS	54s
Test stable X11	1m 50s
Test stable Android	1m 43s
Test stable iOS Aarch64	1m 24s
Test nightly Redox OS	59s
Test nightly macOS x86_64	1m 46s
Test nightly iOS x86_64	1m 18s
Test nightly Wayland	2m 10s
Test stable iOS x86_64	1m 47s
Test stable Linux 64bit	2m 10s
Test stable macOS x86_64	1m 26s
Test nightly Windows 64bit GNU	2m 5s
Test nightly Windows 64bit MSVC	1m 53s
Test nightly Linux 32bit	2m 44s
Test 1.85 Windows 64bit MSVC	1m 6s
Test nightly iOS Aarch64	1m 3s
Test nightly macOS Aarch64	1m 52s
Test nightly X11	1m 57s
Test 1.85 Windows 64bit GNU	1m 23s
Test 1.85 Linux 64bit	1m 25s
Test stable Wayland	1m 57s
Test nightly Web	3m 38s
Test 1.85 macOS Aarch64	47s
Test 1.85 Linux 32bit	1m 50s
Test 1.85 Web	1m 24s
Test stable Web	2m 23s
Test 1.85 iOS Aarch64	1m 0s
Test nightly Android	1m 33s
Test 1.85 Android	1m 16s
Test nightly Web Atomic	4m 11s
Test nightly Linux 64bit	2m 25s
Test 1.85 X11	1m 27s
Test 1.85 Windows 32bit GNU	1m 31s
Test 1.85 Wayland	1m 32s
Test 1.85 Windows 32bit MSVC	57s
Test 1.85 macOS x86_64	1m 4s
Test 1.85 iOS x86_64	57s
	1h 20m 14s

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