String: Add .is-empty and .character-count properties #19318

Job	Run time
android	2m 23s
cpp_cmake (macos-14, 1.77)	8m 32s
build_and_test (ubuntu-22.04, 1.77)	15m 5s
cpp_cmake (windows-2022, nightly)	10m 52s
build_and_test (macos-14, stable)	11m 42s
cpp_test_driver (ubuntu-22.04)	7m 16s
cpp_cmake (ubuntu-22.04, stable)	7m 26s
build_and_test (windows-2022, stable)	20m 9s
cpp_test_driver (macos-13)	10m 9s
build_and_test (windows-2022, 1.77)	17m 1s
cpp_test_driver (windows-2022)	10m 35s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	26m 47s
esp-idf-quick	9m 21s
build_and_test (ubuntu-22.04, nightly)	20m 46s
ffi_32bit_build	1m 28s
fmt_test	2m 21s
mcu (pico-st7789, thumbv6m-none-eabi)	52s
mcu_esp	3m 0s
mcu (pico2-st7789, thumbv8m.main-none-eabihf)	51s
miri	1m 1s
mcu (stm32h735g, thumbv7em-none-eabihf)	52s
node_test (ubuntu-22.04)	4m 24s
python_test (ubuntu-22.04)	2m 46s
node_test (macos-14)	3m 36s
python_test (macos-14)	1m 53s
node_test (windows-2022)	7m 4s
updater_test (0.3.0)	1m 43s
python_test (windows-2022)	4m 57s
vsce_build_test	6m 23s
docs / docs	16m 51s
tree-sitter / tree-sitter-tests	9s
wasm_demo / wasm_demo	2m 58s
wasm / wasm	5m 3s
cpp_package_test	2m 1s
wasm / build-slintpad	1m 38s
	4h 9m 55s

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