String: Add .is-empty and .character-count properties #19095

Job	Run time
python_test (ubuntu-22.04)	1m 20s
python_test (macos-14)	1m 12s
build_and_test (ubuntu-22.04, 1.77)	13m 45s
build_and_test (macos-14, stable)	9m 22s
build_and_test (windows-2022, stable)	14m 52s
python_test (windows-2022)	2m 53s
build_and_test (windows-2022, 1.77)	14m 47s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	22m 10s
cpp_cmake (macos-14, 1.77)	7m 3s
build_and_test (ubuntu-22.04, nightly)	16m 8s
cpp_cmake (windows-2022, nightly)	8m 32s
cpp_test_driver (ubuntu-22.04)	6m 59s
ffi_32bit_build	1m 14s
cpp_test_driver (macos-13)	7m 18s
cpp_cmake (ubuntu-22.04, stable)	7m 3s
cpp_test_driver (windows-2022)	7m 1s
mcu (pico-st7789, thumbv6m-none-eabi)	38s
mcu_esp	2m 42s
mcu (pico2-st7789, thumbv8m.main-none-eabihf)	27s
node_test (ubuntu-22.04)	3m 6s
mcu (stm32h735g, thumbv7em-none-eabihf)	42s
node_test (macos-14)	2m 26s
vsce_build_test	5m 54s
node_test (windows-2022)	6m 1s
android	2m 2s
esp-idf-quick	9m 4s
fmt_test	1m 32s
miri	41s
updater_test (0.3.0)	1m 19s
docs / docs	10m 26s
tree-sitter / tree-sitter-tests	9s
wasm / wasm	4m 19s
wasm_demo / wasm_demo	2m 36s
wasm / build-slintpad	2m 10s
cpp_package_test	2m 18s
	3h 20m 11s

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