Import cpu-sparse prototype #2071

Job	Run time
cargo clippy (windows-latest)	1m 2s
cargo check (msrv) (windows-latest)	3m 17s
cargo clippy (macos-latest)	1m 19s
cargo check (aarch64-android)	32s
cargo check (msrv) (macos-latest)	1m 37s
cargo clippy (ubuntu-latest)	1m 5s
cargo check (msrv) (wasm32)	44s
cargo check (msrv) (ubuntu-latest)	45s
cargo clippy (wasm32)	1m 3s
formatting	12s
cargo doc	1m 53s
Prime LFS Cache	7s
cargo test (wasm32)	31s
typos	6s
cargo test (windows-latest)	1m 44s
cargo test (macos-latest)	43s
cargo test (ubuntu-latest)	1m 3s
	17m 43s

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