Rust

Introduce piece acquisition by L1 random-walking algorithm. #3247

Job	Run time
cargo-fmt	3m 27s
cargo-clippy (self-hosted, ubuntu-20.04-x86-64)	6m 58s
cargo-test (self-hosted, ubuntu-20.04-x86-64)	17m 12s
cargo-clippy (self-hosted, macos-12-arm64)	10m 28s
cargo-docs	7m 30s
cargo-test (self-hosted, macos-12-arm64)	23m 43s
cargo-clippy (self-hosted, windows-server-2022-x86-64)	9m 12s
cargo-test (self-hosted, windows-server-2022-x86-64)	19m 42s
	1h 38m 12s

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