sponge-cursor: initial implementation (#1477) #1324

Job	Run time
x86 (x86_64-unknown-linux-gnu, 1.85.0)	23s
test-derive (stable)	26s
cross (powerpc-unknown-linux-gnu, 1.85.0)	42s
minimal-versions / minimal-versions	30s
x86 (x86_64-unknown-linux-gnu, stable)	24s
build (1.85.0, wasm32-unknown-unknown)	14s
build (stable, wasm32-unknown-unknown)	17s
cross (powerpc-unknown-linux-gnu, stable)	44s
build (stable, thumbv7em-none-eabi)	21s
build (1.85.0, thumbv7em-none-eabi)	13s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	35s
build (1.85.0, armv7a-none-eabi)	17s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	17s
test (x86_64-pc-windows-msvc, windows-latest, stable)	35s
cross (aarch64-unknown-linux-gnu, stable)	48s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	23s
test (x86_64-apple-darwin, macos-latest, stable)	20s
build (stable, armv7a-none-eabi)	18s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	46s
test-derive (1.85.0)	27s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	15s
cross (aarch64-unknown-linux-gnu, 1.85.0)	41s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	49s
	10m 45s

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