Register type `BoxShadow` (#16750) #32523

Job	Run time
run-examples-linux-vulkan	10m 52s
run-examples-on-windows-dx12	15m 28s
build-and-install-on-iOS	0s
build-android	0s
check-example-showcase-patches-still-work	0s
build-without-default-features	0s
check-unused-dependencies	0s
run-examples-on-wasm	0s
build-without-default-features-status	0s
Compare Linux screenshots / Send screenshots to Pixel Eagle	6s
	26m 26s

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