lsp: Return the node index as well as the Element ref when filtering #13735

Job	Run time
python_test (ubuntu-22.04)	1m 28s
cpp_test_driver (ubuntu-22.04)	5m 15s
python_test (macos-11)	2m 3s
cpp_test_driver (macos-12)	5m 11s
python_test (windows-2022)	1m 59s
cpp_test_driver (windows-2022)	6m 32s
cpp_cmake (ubuntu-22.04)	6m 1s
build_and_test (ubuntu-22.04, stable)	8m 31s
cpp_cmake (macos-12)	23m 9s
ffi_32bit_build	1m 7s
build_and_test (ubuntu-22.04, 1.70)	9m 12s
cpp_cmake (windows-2022)	8m 17s
mcu (pico-st7789, thumbv6m-none-eabi)	49s
build_and_test (macos-11, stable)	14m 14s
mcu_esp	2m 34s
mcu (stm32h735g, thumbv7em-none-eabihf)	54s
build_and_test (windows-2022, stable)	8m 14s
build_and_test (windows-2022, 1.70)	7m 55s
node_test (ubuntu-22.04)	2m 37s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	7m 13s
node_test (macos-11)	4m 54s
android	1m 37s
node_test (windows-2022)	4m 12s
esp-idf	26m 7s
tree-sitter	11s
fmt_test	1m 33s
uefi-demo	33s
updater_test (0.3.0)	1m 24s
docs / docs	2m 56s
wasm / wasm	3m 48s
wasm_demo / wasm_demo	13m 43s
wasm / build-slintpad	49s
wasm / lint-slintpad	30s
cpp_package_test	2m 12s
	3h 7m 44s

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